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Elephant calves will suck their trunks to comfort themselves. The babies do it for the same reason humans do (it mimics the action of suckling their mothers).

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While you may think that Fido has the same dinnertime experience as you do, he's actually got a much different taste bud arrangement. Humans have about 9,000 taste buds, while dogs have only around 1,700. And while they can identify the same four taste sensations as people, dogs are not fond of salt.