A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
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
The seahorse is the only fish to have a neck.
12
The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2
The elephant brain weighs about 6,000g.
274
The largest earthworm on record was found in South Africa and measured 22 feet.
151
The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255