Intelligence stories

Alex, the African Grey Parrot, was likely one of the most demonstrably intelligent non-human animals in the world when he died prematurely in September of 2007. A final paper on his mathematical prowess has just been published, showing that the bird was likely capable adding sets of numbers in his feathery little head.
It may surprise you to learn pigeons can count much less understand abstract rules about numbers, but in fact, researchers have proved just that. This skill is something previously only showed in rhesus monkey testing from the 1990's. Pigeons, super smart? Apparently.