Dogs have been man's pet for over 14,000 years.
224
The seahorse is the only fish to have a neck.
12
Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Only 3% of bird species have penises.
0