Dogs have been man's pet for over 14,000 years.
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The two oldest cats on record lived to 38 and 34 years old, both were owned by the same owner and lived off a diet of bacon, eggs, broccoli and coffee.
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Alligators can live up to 100 years.
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The elephant brain weighs about 6,000g.
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It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
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