When cats are happy, they may squeeze their eyes shut.
10
Allegedly, Chrysippus, the Greek philosopher, died of laughter after getting his donkey drunk and watching it try to eat figs.
47
Condoms were originally made of animal intestines or linen.
347
Dogs sometimes fake being sick to get attention.
26
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
402