Cows can sleep standing up, but they can only dream lying down.
745
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
Rattlesnake mating sessions have been known to last more than 22 hours.
232
The head of a jellyfish is called the "Bell."
6