{"fact":"While crows can be clever, they sometimes struggle with tasks that seem easy to us, like consistently choosing the second door from the left.","context":"Strange as it may seem to the human subject... these individuals proved entirely incapable of learning to enter directly the second compartment from the left in a series of compartments.","source":"Charles A. Coburn; Robert M. Yerkes, A study of the behavior of the crow Corvus Americanus Aud. by the multiple choice method., 10.1037/h0076090","index":20}