From Dumb Doggo.

These are some of the SMARTEST animals in history! (excluding me of course)

Thanks for watching!

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00:00 – Big Brain Baboon (Jack the Signal Man)
02:30 – Big Brain Chimp (Ayumu – Ai Project)
04:26 – Big Brain Horse (Clever Hans)
06:21 – Big Brain Parrot (Alex the Parrot)
08:26 – Big Brain Dolphin (Pelorus Jack)

CORRECTION:
At 2:25, the baboon shown in the picture is actually Corporal Jackie from WW1. I got confused because they were both named Jack whoops. Thanks to @asahardison299 for the correction!