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Crows caw, whereas ____ are larger and make croaking sounds.
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caribou
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White mulberry leaves are a favorite food for ____.
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krill
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Most common ____ breed on or near Iceland.
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locusts
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Arctic ____ have the longest migration journeys.
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puffins
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Mammoths, elephants, and ____ have large teeth called tusks.
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ravens
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Cicadas are true bugs, whereas ____ are grasshoppers.
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silkworms
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Blue whales eat small shrimp-like creatures called ____.
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terns
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Lichen is a major food source for ____.
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walruses
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