A dolphin's flipper has five digits and nearly the same bone structure as a human arm and hand.
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Dolphins sleep in a semi-alert state by resting one side of their brain at a time.
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Some dolphins can hold their breath under water for as long as 30 minutes.
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Dolphins look like fish but they are really mammals.
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Every dolphin has its own signature whistle to distinguish it from other dolphins, much like a human fingerprint.
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In the wild, dolphins can live to the age of 50.
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Dolphins communicate in several forms through whistles, clicks and sounds.
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Dolphins nap with one eye open.
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Like a bat, dolphins use echolocation to navigate and hunt, bouncing high-pitched sounds off of objects, and listening for the echoes.
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Dolphins can jump up to 20 feet above water.
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Unlike any other mammals, dolphin babies are born tail first.
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An adult dolphin can consume 30 pounds of fish or more in a single day.
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Dolphins swallow fish whole, despite having 100 teeth in their mouths.
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Dolphins sleep with one eye open!
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Humans and dolphins are the only species that have sex for pleasure.
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The smallest species of dolphin, the vaquita, is only four feet long and lives only in the Sea of Cortez.
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