Common seal swimming underwater
Media playback is unsupported on your device

Oxygen mystery: How marine mammals hold their breath

Scientists say they have solved the mystery of one of the most extreme adaptations in the animal kingdom: how marine mammals store enough oxygen to hold their breath for up to an hour.

The team studied myoglobin, an oxygen-storing protein in mammals' muscles and found that, in whales and seals, it has special "non-stick" properties.

This allowed the animals to pack huge amounts of oxygen into their muscles without "clogging them up".

Victoria Gill reports.

  • 14 Jun 2013
Go to next video: Sea mammal breath-holding explained