Nautiloids Thrived For 500 Million Years Until These Guys Showed Up

Рет қаралды 572,497

Күн бұрын

Around 30 million years ago, a new group of predators began to push nautiloids from their former global range into a single remaining refuge. But who were these predators?
Thanks to Ceri Thomas for the excellent nautiloid, seal, and whale reconstructions!
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References: docs.google.com/document/d/1W...

Пікірлер: 938

@wrenleader4409 Жыл бұрын

You could say their fates were... sealed!

@elmarko9051 Жыл бұрын

The pun it hurts!

@theperfectbotsteve4916 Жыл бұрын

dies*

@mide8845 Жыл бұрын

Approved

@thepalegalilean Жыл бұрын

Take this upvote and get out!!

@barbiquearea Жыл бұрын

Damn, you beat me to it.

@rl9217 Жыл бұрын

Nautiloids: I fear no extinction event, but that thing… Seal: (slowly bouncing towards the water) Nautiloids: It scares me.

@TheRealBekathy Жыл бұрын

best rendition so far.

@texasbeast239 Жыл бұрын

Arf! Arf! *shivers*

@kage3587 Жыл бұрын

Sealvision: Sees friendly swirled hard candy trying to swim away, so it catches and eats the sweet treat. Reality: Nautilus swimming away for its life, and then being caught and crunched on.

@RyuuseiBoy Жыл бұрын

Seal : *aggressively slaps belly*

@katherineheasley6196 Жыл бұрын

Seals do look terribly silly on land. Then they turn into torpedoes in the water.

@victoriaeads6126 Жыл бұрын

It seems like the pinnipeds might also have another advantage. All the other predators had fully developed flippers, not forelimbs that could grip in any way. If the pinnipeds could hold the nautiloids, even just to keep it somewhat immobile, it would give those piercing jaws an even bigger advantage

@RedHair651 Жыл бұрын

Yeah, I thought "gripping paws" was going to be the answer

@nickzaytz5712 Жыл бұрын

Also seals can take nautiloids to the land and deal with them there

@aldrichhezekiah3524 Жыл бұрын

Their fate was sealed..

@jmh8817 Жыл бұрын

My thoughts exactly!

@dewodinodragon6512 Жыл бұрын

How about nothosaurus? Too weak ?

@CoralReaper707 Жыл бұрын

Nautiloids and other cephalopods with shells were always so fascinating to me

@GreasyFox Жыл бұрын

They are like the iconic paleontology icons

@gluteusmaximus8881 Жыл бұрын

This is why I got an ammonite shell as my first tattoo!

@cdk1016 Жыл бұрын

Same here. Nautiloids are my favorite sea creatures. They are just so bizarre and far from the natural line of evolution. Like a giant snail tried to eat a squid and instead it simply absorbed it and they became one. Or maybe an octopus was evolutionarily inspired by hermit crabs. 😂

@caloocanboy5800 Жыл бұрын

I have a nautiloid shell in my collection lol

@ericbrown1101 Жыл бұрын

@@cdk1016 I have a personal affection for trilobites myself. Such a shame they're gone.

@Golem33 Жыл бұрын

It’s interesting that pinnipeds also impacted penguin diversity, they outcompete everything

@Ezullof Жыл бұрын

Competition is against species filling the same niche. Pinnipeds prey on penguins, so it's not outcompeting.

@rodrigoborges3876 Жыл бұрын

i think ancient cetaceans also gave penguin ancestors a run for their money and caused a big decline in their diversity

@LimeyLassen Жыл бұрын

@@Ezullof No, I don't think that definition is right.

@erikarussell1142 Жыл бұрын

Gods perfect killing machine.

@ibrav7979 Жыл бұрын

Wait what types of penguins used to exist then?

@devinsmith4790 Жыл бұрын

Nautiloids are the evolutionary equivalent of "if it ain't broke don't fix it".

@LeFanDesBugs Жыл бұрын

Horseshoe crabs are

@ReaverPrime Жыл бұрын

Just like sharks and crocs.

@telendar_ Жыл бұрын

The nautiloids didn't disappear. They turned into crabs

@spindash64 Жыл бұрын

Until it broke

@jeremiahalguire8231 Жыл бұрын

@Telendar lmao no they didn't smh wtf did you pull that out of? Cephalopods are not related to crabs nor will they ever evolve into crabs lmao f.f.s

@Reyma777 Жыл бұрын

I would have never have assumed that Pinnipeds were a potential cause of Nautiloids declining. The Nautiloids out lasted, placoderms, ichthyosaurs, mosasaurs, plesiosaurs and marine crocodilians and even thrived with sharks. Perhaps Pinnipeds may have been prone to heavily preying on Nautiloids in the past due to their high metabolisms ?

@concon9107 Жыл бұрын

It's probably because they have lips capable of sucking nautiloids out of their shells.

@feandil666 Жыл бұрын

Maybe they're just the most clever

@edwardsantos3602 Жыл бұрын

Well, until they will become extinct soon by humans

@TiagoH1710 Жыл бұрын

@@feandil666 dolphins?

@brettwood1351 Жыл бұрын

@@feandil666 Combination probably. As Mammals they have both higher metabolisms that means they need to eat more, and also high intelligence. And as species like the Elephant Seal show, even going deeper isn't a garuantee of safety.

@RedHair651 Жыл бұрын

It would have been interesting to at least mention in passing why pinnipeds aren't present in that area.

@garthrogers2269 Жыл бұрын

Saltwater crocodiles, probably. That part of the world is their "turf".

@dosadnizub Жыл бұрын

Also, why nautiloids aren't present in open ocean waters where you don't get seals afaik

@JubioHDX Жыл бұрын

@@dosadnizub im just taking a guess on this one but from the diagrams shown in the video it seems like in the past there were signs of nautiloids being in more of the ocean areas but it also showed these as being areas the pinnipeds moved into but just arent living in anymore due to the environment changing but thats all assuming what they were showing was accurate and not just a visual example

@garthrogers2269 Жыл бұрын

@@dosadnizub the impact that pinnipeds may have had on nautiloids could be explained by breeding patterns. If nautiloids breeding areas were/are typically in shallower coastal waters, then that could explain their disappearance from the open ocean. Pinnipeds wouldn't have to venture out there to have an impact in that scenario. It would similar to how humans slaughtered pinnipeds & penguins, and wiped out the Great Auk. We attacked their breeding colonies. Orca do the same thing, their favourite hunting grounds are the breeding sites of their prey.

@dosadnizub Жыл бұрын

Another question.... Pinnipeds now live only in arctic circles thanks to humans, why aren't nautiloids recovering?

@yissibiiyte Жыл бұрын

At least the nautilus is still around

@chilling_at_pontiff Жыл бұрын

Literally saw this yesterday and blew my mind

@yissibiiyte Жыл бұрын

@@chilling_at_pontiff lemme guess, you knew about ammonites before nautiluses?

@C_In_Outlaw3817 Жыл бұрын

Yea you’re right

@MrInsdor Жыл бұрын

the chambered nautilus is my favourite animal there was a lot I didn't know about beforehand in this video I wish the nautiloids another hundreds of millions of years no matter how small their habitat might become

@lordeppiothe1 Жыл бұрын

or maybe they'll evolve an adaptation that allows them to thrive everywhere again :) they earned their permanent spot on the planet.

@danieltabin6470 Жыл бұрын

I hope seals reach Indonesia very soon. Seal gang seal gang 🦾🦭

@MrInsdor Жыл бұрын

@@danieltabin6470 vegetarian seals?🥺

@angeliparraguirre7329 Жыл бұрын

@MrInsdor that would be cool

@Entety303 Жыл бұрын

@@danieltabin6470 I am gonna get the club and well it won’t be nice. Nautilus are superior

@rl9217 Жыл бұрын

Nautiloids after surviving countless extinctions: You can’t defeat me! Earth: I know, but he can! Pinnipeds:

@josephbernard5240 Жыл бұрын

*round seal sitting on shoreline*

@wolfpackastrobiology3690 5 ай бұрын

What I think is fascinating about this is that since no animal evolved to replace the niche nautiloids did (the shelled nektonic niche), the pierce feeding strategy of the pinnipeds not only extirpated the nautiloids from most of the world's oceans; it essentially rendered the shelled nektonic niche non viable. Why I see this is profound is that it throws a monkey wrench into the way we view evolutionary ecology were an organisms fills a niche, goes extinct only to have another organism fill the niche. Here, the niche itself was eliminated by an evolutionary innovation.

@Krankenwagen571 17 күн бұрын

Wow but seals aren't the apex predators tho , they also support a chain where orcas and sharks and dolphins and other seals are sitting T top

@wolfpackastrobiology3690 17 күн бұрын

@@Krankenwagen571 They don't have to be top predators to have a profound affect. Feral cats aren't "top predators" in Australia (Dingos do sometimes kill cats) but they still have a devastating impact on the native fauna.

@guifdcanalli 6 ай бұрын

Asteroids, cataclysmic volcanoes, continents breaking apart Nautiloids: sleep Some funny sea dogs appear Nautiloids: *danger*

@Whomobile Жыл бұрын

I hope the Nautiloids hang around for many more years, they're cool lil' animals

@dinohall2595 Жыл бұрын

The evolution of the pinnipeds really sealed the nautiloids' fate.

@RK-cj4oc Жыл бұрын

@lerneanlion Жыл бұрын

Now, I am imagining the world where the cephalapod-like civilization has been developed and they have to run and hide in fear from some sort of deadly seals! Just imagine how terrifying that would be as a nautiloid!

@Zimisce85 Жыл бұрын

Sounds like a great episode for a science-fiction novel / graphic novel / tv series.

@lerneanlion 9 ай бұрын

@@Drust0 No but humans used to ru nand hide in fear of the Subjects of Ymir when they were turned into Titans.

@halonothing1 Жыл бұрын

I always see these large, decorative slabs of limestone near schools and parks. When I looked closer at them, I noticed they're absolutely covered with sea creature fossils! Not just one or two of the blocks, but pretty much every single one I've ever looked at, regardless of location. I found out later limestone basically IS made of crushed up shells of ancient animals, so even the stone itself is a fossil. I'm far from an expert, but some of it looks like it they could be nautiloids, and there are lots of ammonites and horn corals. It's a shame because a lot of these are just a couple of hundred yards from schools which have no idea the treasure trove of education sitting right outside their doors. I'm tempted to write the schoolboard and suggest they look into working this into their syllabus. It's like a field trip without ever having to leave the school or spend any money.

@transnewt Жыл бұрын

pinnipeds as nautiloid predators... makes sense. carnivorans (really all therapsids) seem predestined to very strong bites, which is useful in cracking shells.

@andreiryancaballero7422 5 ай бұрын

And somehow same nautiluses managed to coesist with Jurassic pliosaurs which had similarly strong bites...

@transnewt 5 ай бұрын

@@andreiryancaballero7422 well the neck theory doesnt really make sense either, but its pretty clear thats what happened. i suppose the real answer is... suction? nautiloids didnt have to deal with any sort of super suction based hunter since the eugenodonts, so i suppose that couldve been how seals dominated.

@transnewt 5 ай бұрын

but seals dont suck their prey

@takenname8053 Жыл бұрын

SUPER NICE, didn't even know Nautilus was secluded on to one area

@patpowers9210 Жыл бұрын

I guess you could say that pinnepeds sealed the deal on nautiloid extinctions.

@KT-xd9yt Жыл бұрын

This is one of the highest quality channels out there

@Justinbrown-ri1bm Жыл бұрын

Hello 👋

@dunyacaliskan7495 11 ай бұрын

They kinda clickbait sometimes.

@alexcamacho1842 Жыл бұрын

Nautiloid: “I fear no mass extinction… but that *thing* *one blubbery boi* Nautiloid: “…it scares me.”

@NishithThakkar Жыл бұрын

Early nautilus forms look like a squid with a wizard hat on.

@TragoudistrosMPH Жыл бұрын

I actually laughed out loud

@Curiouscucumber738 Жыл бұрын

Hey could you do a segment on parasitic barnacles? I find them incredibly fascinating. As always, great content!

@sameerthakur720 Жыл бұрын

Yes. Billions of Blue Blistering Barnacles in Ten Thousand Thundering Typhoons

@joshuag.a287 Жыл бұрын

This video has made me very curious about the absence of pinnipeds in the Indo-pacific. Does anyone know why it is ?

@juliusnatrup5916 Жыл бұрын

It seems most pinnipeds need cold water (below 20°C) to thrive. They mostly live in arctic or moderate seas or along cold currents in warmer or even tropical regions. The Indo-Pacific is generally speaking too warm for them.

@joshuag.a287 Жыл бұрын

@@juliusnatrup5916 thanks!

@markleyp03 Жыл бұрын

@@juliusnatrup5916 maybe climate change will drive pinnipeds out, and nautoloids will take over again. I *welcome* our new/old overlords

@animalnerd4368 Жыл бұрын

@@juliusnatrup5916 Wasn’t there a species of seal that lived in the Caribbean?

@chasenwild5133 Жыл бұрын

My guess is the Saltwater Crocodile. They inhabit the exact same range as the nautilus.

@TheUltimateBlaziken Жыл бұрын

I'd love to see theories and/or a video on how our friend the coelacanth survived

@sydhenderson6753 Жыл бұрын

Partially because they moved to the deep ocean, but why this worked, I don't know.

@barbiquearea Жыл бұрын

I guess you could say, for the nautiloids, the arrival of pinnipeds had all but SEALED their fate.

@LymanPhillips Жыл бұрын

Boo-hiss!

@dustman96 Жыл бұрын

I thought this was pretyy witty.

@Leomoon101 Жыл бұрын

Aahhh, I see what you did there...😏

@iandecker8157 Жыл бұрын

they’re not-a-loitering any longer

@S-T-E-V-E Жыл бұрын

I've always been fascinated by the Nautilus and it's longevity, I even bought a Nautilus Shell I found at a seaside curiosity store! To think how ancient the lineage is, they are truly living fossils!

@davidc5191 Жыл бұрын

And did you know the growth rings on their coiled shells are based on the fibonacci mathematical pattern?

@S-T-E-V-E Жыл бұрын

@Cyber Ghost Nah it was washed up in the UK!

@vaelophisnyx9873 Жыл бұрын

@@davidc5191 you have that a bit backward

@ilkoderez601 Жыл бұрын

One of the best KZfaq channels.

@1TakoyakiStore Жыл бұрын

Something still doesn't add up here. 1) Pinnipeds, with the exception of the now extinct Caribbean Monk Seal (their populations were never high historically iirc) have been notoriously absent from the oceans around Central America, to add to that the Puerto Rican Trench could have provided a refuge even if pinnipeds had been numerous there at some point in the last 30 million years. 2) There are plenty of fish species that have the ability to extract a mollusk from its shell. So it presumably can't just be that reason alone, if at all. 3) There are pelagic cephalopods (squids & argonauts) in open water, a place that a lot of pinnipeds rarely frequent due to lack of a place to rest & food is spread too thin (i.e. there are no pelagic pinnipeds to my knowledge). So if pinnipeds were the problem then nautiloids should have still persisted in the open ocean near the surface like argonauts. 4) I find it hard to believe that the ecological niche that pinnipeds now occupy was never filled in over the 470 million years prior that could have evolved such a detrimental strategy to the nautiloids.

@a.w.1820 Жыл бұрын

go write a paper and take it up with them

@aLazyFairy Жыл бұрын

@@a.w.1820he’s got better things to do like debate anime

@Putukusi Жыл бұрын

I'm not sure if there are fishes that eat nautiluses on a regular basis. There are many fish groups (e.g. labrids) that are adapted to eat hard-shelled animals as mollluscans and crustaceans but they are bottom-feeders and I find unlikely that most of them can handle the nektonic nautiluses.

@buriedghostlady Жыл бұрын

The guy makes some reasonable points with a clear intention to learn and debate, an all you guys come up with is some basic insults and the always useless "go do it yourself then lmao". Real funny that you respond to criticism in a science channel with blatant anti-intellectualism. I'm no better either...

@Great_Olaf5 Жыл бұрын

A couple others have pointed out that pinnipeds maintain some degree of manipulation ability with their forelimbs, which could allow them to more effectively immobilize nautiloids once they caught them, giving them an edge over other animals with a similar feeding style. I've got nothing for the questions relating to geographic extent though, something to dig into.

@Leomoon101 Жыл бұрын

I take it for what it is in terms of Eons finally talking about seals, although their evolution is mysterious. I'm hoping you'll talk about this for a long time. Also burning question in my mind: what made the indo-pacific region of the ocean inhabitable for the early seals? That is pretty interesting to know.

@NotSomeJustinWithoutAMoustache Жыл бұрын

According to a bunch of the replies I've read, saltwater crocodiles and hot waters.

@Chordat3 Жыл бұрын

prolly the saltwatr crocs. Unlike orca and sharks, crocs can follow the seals to the land

@tlac4120 Жыл бұрын

It's the same every time: Starting an eons video, recognising the different hosts with the first spoken word long before seeing them on screen. Makes me smile every time. Interesting topics in well written and edited videos hosted by great science communicators. Triple Win! 🥳

@TSmith-yy3cc Жыл бұрын

This is fascinating! The art is just fantastic as well! Thank you all for your work.

@quantumfoam539 Жыл бұрын

Rip to the glorious Nautiloid Empire

@kendall658 Жыл бұрын

For how predator-proof the nautiloids are, it's wild that a predator can eat them, let alone cute pinnipeds sucking them out of their shells! Pinnipeds are METAL

@aplaceinthestars3207 Жыл бұрын

I like that the conclusion of the video is, roughly, "Seals are the harbingers of chaos".

@holyek7892 Жыл бұрын

This episode has my seal of approval!

@killercompy631 Жыл бұрын

First surviving allmoste all mass extinctions and then being driven to extinction by a living sausage must be pretty depressing

@DISTurbedwaffle918 Жыл бұрын

Nautiloid: "I am a living tank, perfected by 500 million years of evolution and the survival of numerous global extinction events, nothing could possibly threaten me." Pinnipeds: *børk* Nautiloids: *AAG-*

@TheAppalachianEsq Жыл бұрын

What happened to Konstantin’s studio? Also, this host has improved by 150% since she started. I was critical at first so I have to point out how much better their presentation is now!

@tiffanykeefe2368 Жыл бұрын

Love your hair Michelle ❤

@Alberad08 Жыл бұрын

Thank you for sharing! BTW that doesn't count for deep sea specialists like the Allonautili which, for whatever reason, seem to be also restricted to the southern Pacific around New Guinea and the Solomon Islands.

@norasonora6928 8 ай бұрын

I found the outro with reference to where the fossils came from citing the original native inhabitants to be fantastic. It's a small thing but I think it's great

@Eashaans Жыл бұрын

thank you so much this video was so insighful!

@CarthagoMike Жыл бұрын

Great documentary as always!

@sidilicious11 Жыл бұрын

Nautiloids we’re around for 500 million years. That’s a long run guys!

@brianmsahin Жыл бұрын

Wonderful video, clear and concise with great art and presentation. 😁

@jso6790 Жыл бұрын

I love this so much. I learn sooo very much from this show, every single time!

@amphicyon4359 Жыл бұрын

Wow, this was really interesting. Like not only the teeth allowing seals to piece shells, but also their paws early pinnipeds had to hold onto and manipulate nautiloids in ways that early whales couldn't, given they arose from ungulates instead of carnivores

@falnica Жыл бұрын

Now I'm wondering why there aren't seals in Indonesia

@barbiquearea Жыл бұрын

There are dolphins and whales.

@bjorntheviking6039 Жыл бұрын

Too warm.

@Apathetic_agnostic Жыл бұрын

@@bjorntheviking6039 Doubtful; remember Caribbean Monk Seal which lived in pretty warm waters.

@princevermilion8799 Жыл бұрын

i hypothesise that saltwater crocs could be to problematic for seals, if you look at the range of salties and the range of nautiluses you will see they are very similar

@raymondleung6522 Жыл бұрын

loving this educational content from yall, stay learning

@0l550 6 ай бұрын

That was awesome! I mean I hate huge extensions but I love using carnival good old fashion, detective techniques to solve million year old questions. Thank you.

@Xnaut314 Жыл бұрын

An interesting proposal, but it comes with a large contradictory question that hasn't been answered and was frankly ignored completely. If it really is true that pinnipeds, likely the phocids or true seals specifically since they is the better adapted family for shellfish foraging, were the determining factor in the decline of the remaining nautiloid groups after the K-PG extinction then why is the Indo-Pacific interchange region the final stronghold of their distribution? It's not enough to simply say that there are no pinnipeds there, as you also have to propose why pinnipeds never expanded their range there in the past and why they can't currently migrate there to finish them off. This hypothesis also doesn't explain why nautiloids were extripated in the Indian Ocean as well since pinnipeds never radiated there to prey on them either. Despite my criticisms though, I actually like this hypothesis a lot in some areas and would love to see it and it's contradictions researched further.

@Beryllahawk Жыл бұрын

I feel like there's a few follow up papers to be found in those questions! :D At first I was thinking maybe seals don't live in warm waters in general, but the video made it obvious that wasn't quite true. If water depth is also a factor though, might that be one of the differences for the Indian Ocean too? Maybe there were other critters out-competing the nautiloids there, in other ways than predation? Which would still leave pinnipeds as the "major" cause of the vanishing nautiloids. Or maybe there was a kind of one-two punch, already pressured by whatever other competition existed, when the pinnipeds moved in, the nautiloids just couldn't deal with BOTH sources of trouble at once?

@aff77141 Жыл бұрын

"why they don't migrate to finish them off" seems like an odd question to me; the seals aren't seeking them out, they don't even know they exist, and probably have no interest in going to such warm waters without food resources being an issue, as most seals in that area are arctic acclimated species or at least descended from them

@skan7677 Жыл бұрын

I can see pinnipeds as a posible treat to them. And that's on the huge numbers they congregate on. Imagine a huge colony of Arctocephalus pusillus. They fill kleen up a hole region of the ocean near one of their colonys. Not to mention that when they are not in colonys they scatered across the sea to find food. If there is an advantage or an easy pray to chach they would go after it. Also. The colonys move across time so today they may be on the southern tip.of africa but if the clima changes or the sea corrents do they will move across the map and star another huge colony in anny oter suitable place. (And that must have hapened... we are talking of million of years). Another factor in play is taste. Marine mamals will go far away or trough a lot of truble for a tastyer meal. Maybe nautiloids are to sea mamals like chocolate is to us. Mmm... nauthuloids.

@dosadnizub Жыл бұрын

@@aff77141 true, but if there's a food source that an animal is uniquely qualified to exploit, typically over time that animal will be able to adapt to slightly warmer temperatures or slightly deeper depths to exploit it

@Cillana Жыл бұрын

Someone in another comment suggested that the saltwater crocodiles in the region were to blame

@stevez4120 Жыл бұрын

really sealed the deal

@nsl-u-boot8464 Жыл бұрын

I just love your videos! Great Work!

@andrewbrown6522 8 ай бұрын

Ths thought of seals clearing giant bugs out of the ocean makes me smile.

@timothyhouse1622 Жыл бұрын

So, they found their match in sea doggos.

@morganbonczek6428 Жыл бұрын

Your recognition of discoveries made on Indigenous lands moved me and I applaud you for doing this!

@johnthumble5154 Жыл бұрын

Nothing but pandering

@machfassett5749 Жыл бұрын

@@johnthumble5154 And how many other science channels do you see doing the same thing?

@johnthumble5154 Жыл бұрын

@@machfassett5749 anymore than 0 is too many.

@morganbonczek6428 Жыл бұрын

@@johnthumble5154 There always has to be one troll, doesn't there? Congrats on winning today's first place ribbon in recognition of your trolling efforts and lack of respect to the original inhabitants of the Americas

@johnthumble5154 Жыл бұрын

@@morganbonczek6428 trolling implies I don't believe what I'm saying and only do it to get a rise. You like many other leftards seem to struggle with basic definitions.

@Allan_aka_RocKITEman 10 ай бұрын

I probably first learned about the Nautilus decafes ago on something like a National Geographic Special on TV. Very STRANGE critters.

@gabsteed7365 Жыл бұрын

I love the land disclaimer! I think it would be nice if there were also one at the beginning or if it were read aloud though

@icarusbinns3156 Жыл бұрын

Can I point out an error on the maps? Pinnipeds are found in Lake Baikal! Can we get an episode on how snd why there’s this one freshwater seal? It’d be pretty neat, I think

@Thor-Orion Жыл бұрын

Love what you’ve done with your hair! I agree with another commenter on here that the pinnipeds ability to grab with their forelimbs definitely played a major part in their predation on nautiloids.

@lt2143 Жыл бұрын

Awesome! Learned something new about the nautilus today! 👍

@isabel.bolivia Жыл бұрын

wow, Thnak you for this piece of wisdom

@savorymarshmallows Жыл бұрын

So why aren't there pinnipeds in that region?

@victoriaeads6126 Жыл бұрын

They tend to prefer colder waters, AFAIK. Perhaps the allure of new food sources isn't enough to get them into warmer waters.

@vincentx2850 Жыл бұрын

This idea is skewed by the recent decline of monk seals due to human factors, which used to strive in tropical waters

@princevermilion8799 Жыл бұрын

i theorise that saltwater crocs could be to problematic for seals, if you look at the range of salties and the range of nautiluses you will see they are very similar

@strahlungsopfer Жыл бұрын

love the haircut, you look fabulous!

@runsi174 Жыл бұрын

I was waiting for pinniped episode since Hank mentioned it at the begining of Eons channel 😁

@AniFam Жыл бұрын

Interesting~👍 Thank you for sharing this video~🤗

@mattantonelli4273 Жыл бұрын

we swam out of the ocean and walked on land and we flew out of land to walk on the moon just amazing

@silentcaay Жыл бұрын

It's always a plot twist when the thing causing mass extinction in the present isn't actually humans.

@TragoudistrosMPH Жыл бұрын

I love that you're saying the epoch And year range. I don't have all of those memorized. (Though I Do have my Patreon card :p)

@Solis_Pulchrus Жыл бұрын

It's really funny to think that these long lasting nautiloids were wiped out by a bunch of round chonky bois.

@Apathetic_agnostic Жыл бұрын

I suppose, after the extinction of Caribbean Monk Seal, Nautiloids could probably live in Caribbean sea.

@Iowa599 Жыл бұрын

How does shell thickness relate to depth? The pressure of water is high, but so is the animals internal pressure. We can't go down there because our internal pressure is relative to ambient air pressure, like they can't come up here.

@entropy8634 Жыл бұрын

Maybe same reason to why shallow fish can’t go deep and deep fish can’t swim shallow. Their internal pressure also coincides with their place, and thick shells allow adaptability

@garethhughes7430 Жыл бұрын

The sturdier the shell, the more the animal can pressurise it to deal with changing pressures. Release pressure in the shallows, build it up in the depths.

@Iowa599 Жыл бұрын

If that's so, to allow them a greater difference internally:ambient depth pressure, then where are their eyes? Under the shell would make them pointless, but if not, they are exposed. Besides, the pressure doesn't act only on the shell, it squishes every nook & cranny, top or bottom. So water would force its way into the shell, between the shell & flesh.

@garethhughes7430 Жыл бұрын

@@Iowa599 Well I'm sorry, that's literally just how it works. The thicker shells allow for lower depths, as it holds up to the pressure. The soft parts of the nautilus are able to resist the pressure with deformation, rather than the shell which if it was too weak would shatter. Now, Nautiloids can get something similar to the bends, if they fill their shell with water too rapidly, but for the most part they control how bouyant they are. The shell behaves as a brittle ma- terial under stress: with increased pressure, deformation is gradual and linear up to the point of implosion. The reason for the nautilus' greater depth tolerance, while retaining simple sutures, is simply that they have thicker shells than the ...

@melimelon5368 3 ай бұрын

Seals: unprecedented chaos

@mikebauer6917 Жыл бұрын

Very interesting. I never thought about nautiloids disappearing like that.

@valentyn.kostiuk Жыл бұрын

You definitely got more productive. That's great!❤

@historybuff7491 Жыл бұрын

Never thought I would think of seals as the enemy. I know it is just nature.

@AG-tl8oq Жыл бұрын

We can't lose these guys!

@__nog642 Жыл бұрын

9:00 Kinda confused what's stopping the Nautiloids from spreading to the middle of the south Pacific

@thegovenor4629 Жыл бұрын

So you can say, that they sealed the deal for the nautilus?

@huldu Жыл бұрын

Also the problem could be that there were just too many seals and too few predators keeping them in check. Might be a bit different today with us humans around, maybe the nautiloids will bounce back once we've dealt with the seals.

@itzhellraptor._.9923 Жыл бұрын

Shut up moron

@duelme1234 Жыл бұрын

Can I ask why you use the word "deal"?

@barbiquearea Жыл бұрын

I mean there were sharks around. They should have kept the seal population in check.

@wolfie1703 Жыл бұрын

@@duelme1234 i think they're using it kind of sarcastically, since us humans are wiping out a lot of species.

@stefanostokatlidis4861 Жыл бұрын

@@duelme1234 because carnivoran mammals tend to behave as pests.

@adrianpaterson117 Жыл бұрын

I prefer the idea that Nautilus' shell coiled to become a stability device

@TimeTheory2099 Жыл бұрын

Thanks PBS Eons. 👍 Anyone know if there are programs to grow more numbers in zoos or aquariums?

@akumaking1 Жыл бұрын

When will PBSeons collab with Paleo Analysis?

@veggieboyultimate Жыл бұрын

To think one of the cutest animals alive could be responsible for a near extinction of an animal.

@timons8793 Жыл бұрын

An excellent video, with a solid hypothesis…but I have one MAJOR problem with it…Plate Tectonics. The surface of the Earth has not always looked as it does today.

@indyreno2933 Жыл бұрын

Cephalopods are divided into two living subclasses Nautilaceae (Nautili and Fossil Relatives) and Coleaceae (Squid, Cuttlefish, Octopi, and Vampire Squid).

@Ezullof Жыл бұрын

I always find it hard to believe that a predator in an open environment can drive a prey to extinction. Yes, a predator coming to a close ecosystem from a larger one, that's the island situation. But here we're talking about oceans and seas that are all linked to each other. And we are also not just talking about Whales and Mosasaurs, but also all kinds of predators of various sizes, including the weird Triassic ones that were about the same size as a seal - not to mention sea crocodiles that very likely preyed on nautiloids as well, and various kinds of fishes. It seems to me that pinnipeds alone were very likely not the only factor. What about climatic changes? More acidic seas? Competition with other organisms? The pinniped solutions seems too simple to be right. It might have caused directly some species to disappear, but not all nautiloids they encountered.

@johnbaker1256 Жыл бұрын

It could happen if the prey is a high value food (luxury item) but not a staple food.

@andreiryancaballero7422 5 ай бұрын

@@johnbaker1256Sure, today? But what is the definition of high-value items and staple food before Humans even evolved?

@chadbentley6782 Жыл бұрын

Where shark :(

@kalechips4564 Жыл бұрын

In water :D

@sauraplay2095 Жыл бұрын

Another nice video!👍

@realsalu634 Жыл бұрын

Can anyone explain why animals that are so weak and barely adaptable such as the like slugs and snails are still going to this day, but Omanyte overhere got extict while having the same atributes

@alterego3734 Жыл бұрын

Some slugs are pelagic just like fish. I think that's pretty adaptable.

@vincentx2850 Жыл бұрын

The best defence against predators is never strength and speed, but fecundity

@TragoudistrosMPH Жыл бұрын

Had a lot to do with older European thinking about strength and superiority 'fitness' but in reality whatever has kids exists. Being fit for your environment helps make kids that will have kids...but it's extra steps. Have kids and you'll exist. :P

@thomashaapalainen4108 Жыл бұрын

Barley adaptive? Species like the bladder snail can live off anything from leaf litter, algae , dead fish, dead insects, rotten logs, or anything organic. It can survive in frozen lakes to tropical swamps. They reproduce sexually and asexually . It's not hard to see how an animal that can live in stagnant water and can breed by it's self 20 generations of off spring off a few slimy twigs survived mass extinctions.

@anthsallwonky Жыл бұрын

Not only do I love the content you offer but I also appreciate your diverse number of hosts. thanks PBS

@ericvosselmans5657 Жыл бұрын

Nice theory, excellent presentation!. There are some gaps in the theory you present though. The absence of Nautiloids from the Carribean, the waters surrounding India and other tropical waters for instance.

@RocketHarry865 Жыл бұрын

I think there may have been pinnipeds in those regions but now have gone extinct, in case of the Carribean Monk Seal it was because of us.

@snyper182000 Жыл бұрын

2:25 you highlight what is imo much more like a Dunkleosteus Terrelli but maybe a smaller Arthrodira but mentioned a Cephalopod and zoom in on it instead.

@grimmoris Жыл бұрын

Do PBS hosts read KZfaq comments? If that's the case, Love you Michelle

@experience741 Жыл бұрын

Can we survive until the next 500 million years?

@davestagner Жыл бұрын

I actually expect humans to survive the next 500 million years - assuming we don’t create our own replacement (coughcoughAIcough). But that’s assuming we can preserve civilization, one capable of continuously providing enough energy and enough raw materials to last that entire time. Without civilization, we probably won’t last much longer than the typical mammal species at best - maybe a few million years. To provide the energy and raw materials needed for a continuous civilization, the ONLY options at this point are renewables (solar/geothermal) for energy, and near-100% recycling for materials. No more fossil fuels. No more nuclear fission (and probably not fusion). No more “forever chemicals” plastics. Things have to change, a lot.

@barbiquearea Жыл бұрын

@@davestagner For the first time in Earth's history we have a species that can leave the planet. Once we colonize the stars, our linage should be secured even if the Earth goes kaput.

@davestagner Жыл бұрын

@@barbiquearea IF we colonize the stars. There are a lot of potential problems between here and there. And even if we succeed in that, it will be because we solved the other problems I mentioned - powering ourselves purely on renewable sources and recycled materials. We aren’t going to just find Planet Petroleum somewhere to get by on what we’ve been doing for the past 200 years.

@TragoudistrosMPH Жыл бұрын

@@davestagner ironically, civilization is as much cure as curse. Disease has been the great killer of many human civilizations. We find many ruins where famine and disease are assumed culprits. Hunter gatherer societies survive pretty well. It's Great Chain of Being thinking that adds hierarchy to how humans 'should' live. Medicine without self-destruction (war, greed, pollution) could make us outlast ants, bees, and termites that also have civilizations of their own.

@davestagner Жыл бұрын

@@TragoudistrosMPH Community is not the same thing as civilization. And the kind of medicine that can make a real difference requires literacy. Refined materials. Electricity. All sorts of things that hunter-gatherers don’t have.

@onlineanonymity6153 7 ай бұрын

I thnk the map presented around 5:20 raises a greater set of questions. First on what timescale did pinnipeds spread across the globe? It feels unlikely but did they migrate around the world or did multiple species evlove into pinnipeds independently? If the latter, what prompted this evolution?