The most common wild bird in the world isn’t the sparrow or blue jay—it’s the red-billed quelea, which live in Africa and have an estimated population of 1.5 billion.

The chicken is the closest living relative to the Tyrannosaurus Rex.

The penguin is the only bird that can swim, but not fly. It is also the only bird that walks upright.

Crows have the largest cerebral hemispheres (brains), relative to body size, of any avian family.