Dogs have been man's pet for over 14,000 years.
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The elephant brain weighs about 6,000g.
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Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
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Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
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Denmark has twice as many pigs as there are people.
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