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The most massive animal that ever lived on Earth is the ____.
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blue whale
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An ____ is a quill-covered, ant-eating, egg-laying mammal.
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centipede
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An ____ is a large flightless bird native to Africa.
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echidna
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A ____ is a large flightless bird native to South America.
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manatee
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A ____ (sea cow) is a herbivorous marine mammal.
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ostrich
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A ____ has a flat body with one pair of legs per segment.
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pangolin
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A ____ is an ant-eating mammal covered with large scales.
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penguin
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A ____ is an aquatic flightless bird found mostly in Antarctica.
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rhea
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