Dogs have been man's pet for over 14,000 years.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
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Camels and llamas can cross breed. The offspring is called a ‘Cama’.
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Cows can sleep standing up, but they can only dream lying down.
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