Goldfish lose their color if they are kept in dim light or are placed in a body of running water, such as a stream.
12
A duck's quack doesn't echo, and no one knows why.
173
Spiders have transparent blood.
56
Chained dogs are 3 times more likely to bite than unchained dogs.
34
An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
According to scientific studies, a rat's performance in a maze can be improved by playing music written by Mozart.
46
A hippo can open its mouth wide enough to fit a 4 foot tall child inside!
23
Contrary to popular belief, dogs do not only sweat by salivating. They also sweat through the poors on their feet.
30