Animals That Can Live Without Oxygen

This tiny parasite, found in salmon, is the only known animal that doesn't need oxygen to live.

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Tardigrades can survive in space, without air, and even extreme radiation. They enter a death-like state called cryptobiosis.

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Discovered in deep-sea mud, these microscopic animals thrive in oxygen-free, highly toxic environments.

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Some intestinal parasites adapt to anaerobic digestion — thriving without oxygen inside their hosts.

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Goldfish can survive without oxygen for hours by turning carbohydrates into alcohol in low-oxygen water.

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Understanding these creatures could help us explore alien environments, deep-sea life, and disease resilience.

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