Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
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
A 42-foot sperm whale has about 7 tons of oil in it.
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The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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A group of pugs is called a grumble.
10
Domestic pigs average a top speed of about 11 miles per hour.
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