Spiders have transparent blood.
56
An albatross can sleep while it flies!
36
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
A rodent's teeth never stop growing.
16
The placement of a donkey's eyes in its' heads enables it to see all four feet at all times.
96
Squirrels forget where they hide about half of their nuts.
698
Penguins can convert salt water into fresh water.
97