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http://arstechnica.com/science/news/2011/12/pigeons-match-primates-in-number-sense.ars
Course, the Avian Xindi were also wiped out because they didn't have space travel.
birds have been shown to have several higher-order cognitive skills that we previously thought only primates had the brains for. Jays are capable of episodic memory, parrots can solve multi-step puzzles and use a succession of tools to get a food item, and crows have even learned to use city traffic and stoplights to their advantage. Now, Science reports yet another cognitive area where birds are on par with primates: they have a sense of numbers.
Course, the Avian Xindi were also wiped out because they didn't have space travel.
