Tiny Animals That Do Not Need Oxygen

Loricifera are microscopic animals that live in deep-sea sediment without ever needing oxygen. They are the only known complex creatures that spend their entire life cycle in an environment completely devoid of air.

These tiny, corset-shaped creatures thrive in the deepest parts of the ocean where oxygen levels are zero. Instead of relying on mitochondria to breathe, they use specialized structures called hydrogenosomes to produce energy. Scientists were stunned to discover them, as they challenge our fundamental understanding of what it takes for complex life to survive. They prove that life can find a way to flourish in places we once thought were utterly barren.