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Mantis shrimp have at least 12 types of colour receptors. Humans have just three.

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A brightly coloured peacock mantis shrimp on the seabed
Animals

12+

Mantis shrimp have at least 12 types of colour receptors. Humans have just three.

Yes. Many mantis shrimp have 12 or more kinds of photoreceptors for colour, compared with three in humans. But experiments show they are not better at distinguishing close shades, suggesting their eyes work in a different way.

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Octopus vulgaris (common octopus)
Animals

3

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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