Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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There's a phone app called RoboRoach that allows you to remotely control a cockroach through a chip that you to manually implant into the unwitting critter.
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Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
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If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
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15% of snails survive digestion by birds and are found alive in their droppings, potentially leading to the spread of snail populations.
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The reindeer is the only mammal that can see UV light.
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