Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Sloths take two weeks to digest their food.
243
There is a sea snail that wears a suit of iron plated armor. It is the only known animal to use iron sulphide as skeletal material.
9
By putting a frog in a bucket of milk, scientists following up on an ancient Russian way of keeping milk from going sour have identified a wealth of new antibiotic substances.
9
A group of pugs is called a grumble.
10