An alligator can go through 2,000 to 3,000 teeth in a lifetime.
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Dogs sometimes fake being sick to get attention.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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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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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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