A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
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Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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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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