Dinosaurs may have been fierce predators but they had a respiratory system similar to modern birds such as the sparrow, scientists said on Wednesday. Ancient beasts such as the mighty Tyrannosaurus ...

Recent evidence suggests that oxygen levels were suppressed worldwide 175 million to 275 million years ago and fell to precipitously low levels compared with today’s atmosphere, low enough to make ...

ANN ARBOR, Mich.--The remains of a 30-foot-long predatory dinosaur discovered along the banks of Argentina's Rio Colorado is helping to unravel how birds evolved their unusual breathing system.

Scientists have unearthed the remains of a large meat-eating dinosaur with a breathing apparatus much like a modern bird, fortifying the link between birds and dinosaurs and helping to explain the ...

Birds breathe with greater efficiency than humans due to the structure of their lungs--looped airways that facilitate air flows that go in one direction--a team of researchers has found through a ...

Researchers have discovered that birds breathe with greater efficiency than humans due to the structure of their lungs -- looped airways that facilitate air flows that go in one direction. Birds ...