Not a lot about bird brains in general, instead discussion of some informal experimentation with urban crows.<p>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.<p>[0] <a href="https://en.wikipedia.org/wiki/Caracara_(genus)" rel="nofollow">https://en.wikipedia.org/wiki/Caracara_(genus)</a>