Don't give a dog chocolate! Chocolate affects a dog's heart and nervous system; a few ounces are enough to kill a small dog. See more

The blue whale has a heart the size of a small car and its blood vessal is so broad, that a person could swim through it. See more

A shark is the only fish that can blink with both eyes. See more

A shrimp's heart is in its head. See more

One pair of rats has the potential for 15,000 descendants in a year. See more

In ancient Egypt, killing a cat was a crime punishable by death. See more

The rat has been called the world’s most destructive mammal - other than man. See more

The female pigeon cannot lay eggs if she is alone. In order for her ovaries to function, she must be able to see another pigeon. See more

Fish that live more than 800 meters below the ocean surface don't have eyes. See more