The reindeer is the only mammal that can see UV light.
17
In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
9
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
In Australia, there are spiders big enough to eat snakes.
20
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12