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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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Cats recognise the voice of their owner, but never evolved to care.
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Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
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There's a lizard known as the 'Jesus Lizard' that can run across water.
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Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
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