The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
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Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
11
During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
45
Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16
The cat brain weighs about 30g.
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