The world's largest amphibian is the giant salamander. It can grow up to 5 ft. in length.
66
A killer whale's heart beats 30 times a minute under water, 60 times a minute on the surface.
30
Sharks have been on the planet longer than trees.
14
Cat urine glows under a black-light!
43
Dogs have four toes on their hind feet, and five on their front feet.
179
The lifespan of mammals is about 1 and a half billion heartbeats.
127
According to scientific studies, a rat's performance in a maze can be improved by playing music written by Mozart.
46
The average city dog lives three years longer than the average country dog.
38