Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
A domestic cat can sprint at about 31 miles per hour.
274
Dogs have been man's pet for over 14,000 years.
224
Cats recognise the voice of their owner, but never evolved to care.
22