> “Only intelligent animals play—animals like crows and chimps, dogs and humans.” Err, I'm barely knowledgeable in this field (so maybe someone can point out s

> “Only intelligent animals play—animals like crows and chimps, dogs and humans.” Err, I'm barely knowledgeable in this field (so maybe someone can point out something that I'm missing), but I have to nitpick that this strikes me as poor reasoning. Off the top of my head, juvenile squirrels are known to play[1], along with many other species which we would consider less intelligent than cephalopods or even dogs. This just seems like an odd assertion to come from an expert biologist. [1] http://dx.doi.org/10.1016/j.anbehav.2003.06.024 http://dx.doi.org/10.1016/j.anbehav.2003.06.024 Really interesting article, though.