{"fact":"Crows are so good at learning shapes that they can pick out a triangle even if you change its color or just show them its outline!","context":"The discrimination performance was generally not affected either by changes in the colour of the stimuli or when both shape and colour cues conflicted… The use of only outlines of the familiar stimuli also did not affect discrimination behaviour of crows.","source":"Bezawork Afework Bogale; Shoei Sugita, Shape discrimination and concept formation in the jungle crow (Corvus macrorhynchos), 10.1007/s10071-013-0642-y","index":353}