I'm not sure how much I buy the "size of the brain" limitation, given the brain-size ratio between parrots and chimps hardly reflects their intelligence ratio a

I'm not sure how much I buy the "size of the brain" limitation, given the brain-size ratio between parrots and chimps hardly reflects their intelligence ratio as far as we can tell. I tend to believe any creature who has the capacity to learn language also has ehe capacity to solve Sokoban and vice-versa, so testing the easier to test of the two should be the first step and figuring how to teach them a complex language should be the second. (By the way, corvids pass such complex information that some people suspect they already have language, although I would bet against. We know of cases where people the crows hated left a place, returned years later to visit and all the local crows still hated them, and it was implied where I read it that it was long enough that it was all a new generation of crows.