Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
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
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
Female kangaroos have three vaginas.
2