2:40 I had a butcher bird sit under an awning on my veranda when it was raining (staying dry), and start his/her routine. After a while, I heard him say "Bella Bella!" and realized he was mimicking me calling my small dog. Then he did Bella's yap yap sound, then started all over with all the different sounds he'd heard in his territory, including the guy up the hill's wood cutting jigsaw or similar. It was as though he were vocally recalling his territory; every sound in it, and reminding himself of it. I wish I'd had any kind of recording equipment at the time, because apart from some rain, there were no big background sounds to drown him out. Because of this, I realized just how much birds spend listening and observing their environment, and in the butcher bird's case, *he had his region all mapped out vocally (from auditory cues), and knew every important regular inhabitant.*

This lens really shines with sufficient light. At least, in your hands! I was also surprised by the quality of the audio. The background noise was a bit of a problem , but the camera did an excellent job of picking up the bird song. Congrats!