Cows can sleep standing up, but they can only dream lying down.
745
Rattlesnake mating sessions have been known to last more than 22 hours.
232
A scorpion can hold its breath for up to 6 days.
19
If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
13
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9