{"fact":"Crows are better at using sticks to get a stone than the other way around, probably because they're used to using sticks for things like nest building and getting insects.","context":"The crows perform better when using a stick to dislodge a stone than vice versa – probably because they are accustomed to using sticks to manipulate objects, such as building nests and hunting for insects.","source":"Jennifer Vonk, Sticks and stones: Associative learning alone?, 10.3758/s13420-019-00387-4","index":475}