A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
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A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
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Only 3% of bird species have penises.
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It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
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The elephant brain weighs about 6,000g.
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Queen ants have one of the longest life-spans of any known insect - typically up to 30 years. Western harvester ant queens can live up to 40 years!
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