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5. Pigs

Before you tuck into your next BLT, consider this: pigs are smarter than most dogs. Puzzle-solving pigs understand reflections, finding food they have only seen in a mirror. You can more easily house train a small pig than a cat or a dog. And, despite their reputation for wallowing, they’re actually clean animals, only covering themselves in mud to cool off and protect their delicate skin from the sun.

Two curious pigs undefined undefined / Getty Images

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