The reindeer is the only mammal that can see UV light.
17
Dogs sometimes fake being sick to get attention.
26
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Female kangaroos have three vaginas.
2
A puppy is born blind, deaf, and toothless.
16
Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
10