{"fact":"Crows can learn to use tools to get food, even figuring out how to use a stick as a lever!","context":"The crows also showed innovative behavior, in that they persistently wedged the tool (matchstick) between the edge of the response panel and the key, so that it acted as a lever. In this position, they had only to peck the tool in order to operate the response key, which produced food more rapidly and efficiently.","source":"Robert W. Powell; William Kelly, Tool use in captive crows, 10.3758/bf03337704","index":0}