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.

Opening doors may not seem that hard, but when you have a trunk instead of hands, things can get complicated. Researchers tested the problem-solving skills of wild elephants for the first time by ...

The elephant has the largest brain of any land mammal. Its ‘grey matter’ — crucial to thinking and problem-solving — is also more extensive.