Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
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It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
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An alligator can go through 2,000 to 3,000 teeth in a lifetime.
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In 1918, a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
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Cats sleep for 70% of their lives.
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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.
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