The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
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Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
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Cats and dogs can hear ultrasound.
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The largest earthworm on record was found in South Africa and measured 22 feet.
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Sharks, like other fish, have their reproductive organs in their chests.
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A cow produces around 200,000 glasses of milk in her lifetime.
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