Creatures That Thrive Without Oxygen
Painted Turtle
This freshwater turtle can survive in frozen lakes without oxygen for over 100 days by switching to anaerobic metabolism.
Naked Mole Rat
In low-oxygen burrows, naked mole rats can survive for up to 18 minutes by altering their metabolism like plants.
Crucian Carp
These fish live under ice in oxygen-deprived lakes by converting lactic acid into alcohol and releasing it through gills.
Goldfish
Surprisingly, goldfish also survive without oxygen for months using alcohol-producing metabolism similar to crucian carp.
Bristle Worms
These deep-sea worms endure oxygen-depleted zones by drastically lowering their metabolic rates.
Caenorhabditis elegans
This microscopic roundworm can suspend its metabolism in low-oxygen environments, essentially pausing life until oxygen returns.
Loricifera
Discovered in the Mediterranean, these tiny invertebrates live their entire lives in completely oxygen-free deep-sea sediments.
Birds That Sleep While Flying