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.

Source

Wombats are the only animal whose poop is cube-shaped. This is due to how its intestines form the feces. The animals then stack the cubes to mark their territory.

Source

Ed note: It is rumored that one human being rolls his into a ball. It is not known if it is to mark his territory.