Animals

How do you properly spell the substance that a rhino's horn is made of?

More Questions from Animals
Which of these animals is not an amphibian?
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What is a group of whales called?
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What are horses with a propensity to buck called?
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Match species with this description, "brightly-colored, flattened fish that live in shallow warm waters"?
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What are the only mammals that can fly?
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What is the name of the skin that hangs from a turkey's neck?
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What is this nocturnal marsupial?
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In what country did the English Shepherd originate?
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