Lurch, a Watusi bull, had the largest horns in the world.
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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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Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
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Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
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When dragonflies mate, their tails form a love heart.
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