Fish rank as the most diverse group of vertebrates in the world. Scientists recognize over 37,000 distinct species, with many more waiting to be discovered. Most fish fall into the ray-finned group of ...

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

Few predators swallow their prey whole. Even fewer can digest their meals with bones and all. But for some reptiles like the ...

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 ...

Study results advance understanding of how human cells evolved and could help point to new solutions for patients with rare genetic diseases.