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Polar bears are carnivores that mainly eat ____.
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caribou
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Aphids (tiny plant-eating pests) are a favorite food for ____.
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ladybugs
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Penguins, emus, rheas, kiwis, and ____ are flightless birds.
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octopuses
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Lichen is a major food source for ____.
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ostriches
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Arctic ____ have the longest migration journeys.
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ravens
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Crows caw, whereas ____ are larger and make croaking sounds.
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seals
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To escape from predators, ____ can release black ink.
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sloths
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Tree ____ are slow-moving mammals of tropical rainforests.
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terns
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