RE: Someone Calling you Birdbrain? Don't be Offended. Intelligence Part 2.
Actually when it comes to intellect in the bird kingdom, the highest distinction belongs to crows (no offense to the parakeets that have shown formidable intelligence too). But the cognitive capability of crows is vastly superieor to most other birds and even many mammals.
There are plent of examples and experiments documented for this. For example crows in Japan using traffic to put walnuts out to crack and then collecting them when cracked
Crows even understand the principle of water displacement
So how do they do it with the tiny brain - your article is englightening in that aspect - has to be neuron density..
Crows may not be much to look at, but ho boy, do they rock! :)