While fish and many other aquatic animals take air directly from the water through gills, other animals find ingenious ways to drag air bubbles down from the surface or trap air around their bodies.

Mudskippers may be fish, but they spend 90% of their time out of the water, walking through mud and climbing trees.

For the first time, scientists have discovered something they didn’t think existed -- an animal that can’t breathe oxygen — and obviously doesn’t need to.

Which animals can hold their breath underwater the longest? Meet 'Dragon prince' — the newly discovered T. rex relative that roamed Mongolia 86 million years ago.

Scientists said some single-celled organisms, including fungi and amoebas, have also lost the need to breathe over time, but this is the first time it's been documented in an animal.

You’d think all animals would need oxygen to live, right? Wrong. Researchers just discovered a unique organism that doesn’t need to breathe. Instead, the tiny parasite lives in salmon tissue ...

Secondly, for animals to hold their breath, they need lungs, said John Spicer, a marine zoologist at the University of Plymouth in the U.K. "Holding breath only applies to animals with lungs and ...