Sea otters hold hands while sleeping to avoid drifting apart.
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Some birds can imitate sounds from their environment.
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A hummingbird's heart can beat over 1,000 times per minute.
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Some species of penguins can swim at speeds of up to 15 miles per hour.
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Certain birds can recognize themselves in mirrors.
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Many birds use Earth's magnetic field for navigation.
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Some species of jellyfish can shrink and regrow their bodies.
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A wolf's howl can travel several miles.
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Some butterflies migrate across continents.
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