This ancient reptile’s jawbone was unearthed in Arizona in 2011 and was confirmed to be a new species with the aid of modern ...

Researchers have identified how thyroxine, a human thyroid hormone, can positively influence the life-critical calcification ...

A Smithsonian-led team of researchers have discovered North America's oldest known pterosaur, the winged reptiles that lived ...

Greenland sharks live for centuries with slow heartbeats and metabolism. Scientists study their longevity secrets.

Mitochondria are the body's "energy factories," and their proper function is essential for life. Inside mitochondria, a set ...

Mitochondria are the body's "energy factories," and their proper function is essential for life. Inside mitochondria, a set ...

Water and air pose completely different challenges to animals on a number of levels.

eLife Assessment This valuable work formulates an individual-based model to understand the evolution of division of labor in vertebrates, in particular, to examine the role of indirect versus direct ...

Lateral and dorsal views of three-dimensional renderings from high-resolution X-ray scans of zebrafish, bichir, lungfish, axolotl, newt, and lizard. The reconstructions show the anterior skeleton of ...

Myelin appears suddenly in vertebrates, animals with backbones that arose 500 million years ago. Not a trace of it is found in the ancestral line that preceded the arrival of vertebrates.