Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
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A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
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In Australia, there are spiders big enough to eat snakes.
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The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
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