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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The elephant brain weighs about 6,000g.
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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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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In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
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Urechis unicinctus is a species of marine spoon worm that is widely referred to as the ‘penis fish’.
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Dolphins have names for one another.
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The two oldest cats on record lived to 38 and 34 years old, both were owned by the same owner and lived off a diet of bacon, eggs, broccoli and coffee.
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