1. Dolphins Recognize and Admire Themselves in Mirrors.
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  2. There are 40 extant species of dolphins.
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  3. Dolphins have the longest memory in the animal kingdom.
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  4. The U.S. Navy has 75 trained dolphins to detect enemy swimmers and underwater mines.
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  5. The average lifespan of a dolphin is 15 years. However, some of them lived 50 years.
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  6. Dolphins sleep with one eye open.
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  7. Only one-half of a dolphin's brain goes to sleep at a time.
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  8. Dolphins can communicate with one another over a telephone, and appear to know who they are talking to.
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  9. Dolphins and whales give birth
    with the tail first instead of the head.
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  10. Male dolphins are called "bulls", and females "cows".
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  11. A 2-headed dolphin was discovered on a beach in Turkey in 2014.
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  12. Killer Whales are actually dolphins, not whales.
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  13. Dolphin copulation happens belly to belly.
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  14. Dolphins give each other names and will answer to it even when called by dolphins they don't know.
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  15. The wolphin is the result of the union of a bottlenose dolphin and a false killer whale.
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  16. Dolphin meat is consumed in Japan and Peru.
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  17. Infanticide has been observed in bottlenose dolphins.
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  18. There are albino bottlenose dolphins.
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  19. Dolphins and whales squeal
    to express delight.
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  20. In 2014, a deceased two-headed dolphin was discovered washing up on shore in the waters off Turkey's west coast.
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  21. A bottlenose dolphin may use its tail flukes to flip a fish out of the water, and then retrieve the stunned prey.
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  22. A dolphin's stomach is compartmentalized for rapid digestion.
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  23. Some offshore dolphins were found with deep-sea fishes in their stomachs. This evidence suggests that offshore dolphins may dive to more than 500 m (1,600 ft).
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  24. A study indicates that dolphins talk to each other in sentences.
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  25. Dolphins shed the top layer of their skin every two hours.
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  26. Dolphins trained to kill for the Soviet navy were sold to Iran because they could no longer afford to feed it.
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  27. Dolphins intentionally chew on toxic pufferfish to get high.
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  28. Dolphins go on killing sprees when they're sexually frustrated.
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  29. Dolphins tenderise octopuses by bashing them around before eating them.
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  30. Dolphins have no vocal cords.
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  31. Dolphins are not automatic air-breathers like we humans are. Every breath is a conscious effort.
    ♦ SOURCE
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