{"fact":"While crows excel at recognizing shapes, they seem to have a limit.  Changing the size of a familiar shape can throw them off!","context":"Interestingly, jungle crows failed the ‘difficult’ concept learning tests in which the size of the triangular and non-triangular shapes was reduced relative to those used during training and the first concept formation test.","source":"Bezawork Afework Bogale; Shoei Sugita, Shape discrimination and concept formation in the jungle crow (Corvus macrorhynchos), 10.1007/s10071-013-0642-y","index":355}