In general, birds are sometimes surprisingly different to mammals. Their eyes are quite different. For example, raptor vision has a much higher acuity and framerate than ours, and many birds do different things with their left and right eyes. Their respiration is also different (including lungs that have 'in' and 'out' pipes), which allows something like a falcon to eat the moment it has finished hunting, unlike say a cheetah, which has to get its breath back before eating after a successful chase.
Book (no wiki link, but this seems OK): https://www.npr.org/2021/03/31/982631076/-a-most-remarkable-...
Author: https://en.wikipedia.org/wiki/Jonathan_Meiburg
Didn't think I'd see caracaras mentioned when I opened up hacker news this morning, thanks!
I volunteer at a raptor conservation centre and have been impressed by the behaviours of the different birds, and the degree of mentation that is going on (or not). The smartest birds I met there were Caracaras [0] which could be trained to do various tricks, including carrying objects from one place to another, and could solve simple puzzles. Perhaps surprisingly, given their reputation for being wise, owls were some of the least intelligent, partly because their skulls have so much space occupied by their eyes compared with diurnal birds.
[0] https://en.wikipedia.org/wiki/Caracara_(genus)