Dogs sometimes fake being sick to get attention.
26
Bats sleep 18-20 hours per day.
5
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
Tigers can see 6 times better at night than humans.
305
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