The difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.
10
Sheep, goats, octopuses, and toads have rectangular pupils.
7
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
A group of pugs is called a grumble.
10
Penguins have a gland above their eye that turns saltwater into freshwater.
12
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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