The ancestor of all domestic cats is the African Wild Cat which still exists today.
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Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
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When dragonflies mate, their tails form a love heart.
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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