Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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In 1918, a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
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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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Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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When cats are happy, they may squeeze their eyes shut.
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A lion in the wild usually makes no more than twenty kills a year.
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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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