{"fact":"When getting food out of a tube, New Caledonian crows seemed to prefer either the perfect size stick, or just grabbing the longest one available.","context":"Throughout the entire period the crows seemed to use a bimodal rule: “Either choose a stick closely matching the distance of the food, or choose the longest tool in the set”.","source":"Jackie Chappell; A. Kacelnik, Tool selectivity in a non-primate, the New Caledonian crow (Corvus moneduloides), 10.1007/s10071-002-0130-2","index":163}