The Henneguya Salminicola is a tiny parasite that lives in fish and is the only known animal that never needs oxygen.
Also called Water Bears, tardigrades can survive in extreme conditions, including oxygen-free environments.
These tiny deep-sea creatures live in oxygen-free sediments and have adapted to survive without it.
Some sea sponges can survive in low-oxygen environments by slowing their metabolism.
Deep-sea tubeworms rely on symbiotic bacteria for energy and don’t need oxygen to survive.
Also known as Sea Monkeys, they can pause their metabolism and live without oxygen for long periods.
Goldfish can survive in oxygen-free waters by producing alcohol in their bodies instead of needing oxygen.
Some flatworms living in oxygen-poor environments have evolved to survive without it completely.
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