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A pistol shrimp's snap creates a bubble that briefly gets about as hot as the surface of the Sun.

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A pistol shrimp with one oversized claw on the seabed
Animals

Snap

A pistol shrimp's snap creates a bubble that briefly gets about as hot as the surface of the Sun.

Yes, briefly. Pistol shrimp snap their claws so fast they form a cavitation bubble. As it collapses, temperatures inside are estimated to reach several thousand degrees Celsius, around that of the Sun's surface, for a tiny instant.

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Octopus vulgaris (common octopus)
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Octopuses have three hearts and blue blood.

Octopuses have three hearts: two supply the gills and one supplies the rest of the body. Their oxygen-carrying protein contains copper and turns blue when oxygenated.

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Common Wombat (Vombatus ursinus tasmaniensis) on Maria Island, Tasmania, Australia. The entire island is a national park, Maria Island National Park. The adult is just under a metre in length on average.
Animals

Cubes

Wombats poop cubes.

Wombats produce distinctly cube-like droppings, shaped inside the intestine rather than by a square opening. Research links the shape to differences in the mechanical properties of the intestinal wall.

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