The heart of a mouse beats 650 times per minute!
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A polar bear's skin is black. Its fur is not white, but actually clear.
25
If a Lobster loses an eye, it will grow another one.
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The Hercules beetle, despite weighing only 100 grams, can lift 8 kilograms, making it one of the proportionally strongest animals in the world.
8
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
12
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12