A Pigeon Solves the Classic Box-and-Banana Problem

This original footage shows a pigeon solving a reasoning problem involving how to reach a small banana placed just out of its reach. The pigeon considers the situation and then pushes a small box in place under the banana, hops on top of the box, and gets the banana.

Reasoning skills, as well as language, were once thought of as uniquely human traits; what characteristics make humans unique among animals?