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
A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
293
When cats are happy, they may squeeze their eyes shut.
10
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6