Kandula, an 7-year-old elephant that the Smithsonian's National Zoo, has remarkable problem- solving skills. He can use boxes and stepping stools to reach food that was previously out of reach.

Persistence is key: Investigating innovative problem solving by Asian elephants using a novel multi-access box. Animal Cognition, 25 (3), 657-669. doi: 10.1007/s10071-021-01576-3 ...