The Chow and the Chinese Shar-Pei are the only dogs that have black tongues.
32
Catgut comes from sheep not cats.
11
If you keep a goldfish in the dark, it will eventually turn white
408
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A moth has no stomach.
23
Mexican Jumping Beans jump because of moth larvae inside them.
29
Dolphins sleep with one eye open!
52