Henneguya salminicola - A parasite found in salmon that survives without oxygen, making it the only known animal to do so.
Tardigrades (Water Bears) - These microscopic creatures can survive in extreme cold, vacuum space, and total oxygen deprivation.
Ice Worms - Found in glacial ice, these worms thrive at freezing temperatures and would die if exposed to warmth.
Antarctic Krill - These tiny crustaceans can survive in oxygen-poor waters beneath thick ice sheets.
Black Swallower Fish - A deep-sea fish that lives in near-zero oxygen levels and swallows prey much larger than itself.
Loricifera - These tiny marine animals survive in oxygen-free deep-sea sediments by using hydrogen for energy.
Wood Frog - This amphibian freezes solid in winter and revives once temperatures rise, making it a true survival expert.
Devil Worm (Halicephalobus mephisto) - A deep-earth nematode living miles underground, thriving in extreme oxygen-poor conditions.
Yeti Crab - Found near hydrothermal vents, it relies on bacteria growing on its hairy arms instead of oxygen for survival.
Naked Mole Rat - This burrowing rodent can survive without oxygen for up to 18 minutes by switching its metabolism to fructose.
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