probably the horn of something he was trying to conquer, like a buffalo or a wildebeest

@@OliverNorwellHardy makes the most sense for sure. Your right, that's its really amazing that he seems mostly unaffected by it.

@@OliverNorwellHardy I just realized something. I don't think that's brain matter I think that's just the underside flesh under the fur. I don't see a single indication of skull which usually comes before brain. Usually bone heals the slowest so I think this is just a deep horn scalping that looks worse cause of how much it displaced. Also hes acting to casual to me to be in as much pain as would be true if the skull was punctured threw.

Kidonda

elephant unlikely (not too many of them around in this area), rhino impossible (no rhinos in this area) - I would also assume it was the horn of an antelope