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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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Australian Graham Barker has been collecting his own belly button fluff every day since 1984 - keeping it in storage jars.
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An Indian man known as "Snake Manu" can put small snakes, including deadly cobras, into his mouth and pass them out through his nose.
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"Fish odor syndrome" is a rare genetic disorder that causes people to smell like rotten fish.
5
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.
10