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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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
A 42-foot sperm whale has about 7 tons of oil in it.
209
The Pistol Shrimp can snap its claws together to create a sound of 218 decibels, louder than as supersonic jet at full speed. It only lasts for 1 millisecond. The snapping action also creates a bubble that is greater than 5000 Kelvin, close to the surface temperature of the sun.
21
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23