Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
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The seahorse is the only fish to have a neck.
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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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Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
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