An ancient animal’s hammer, anvil, and stirrup bones are at the base of the jaw but completely detached from it.

The silver-backed chevrotain was undetected for decades, but local reports have led researchers to document the species on camera.

The site, Corral Bluffs in Colorado, also reveals how plants evolved and how ecosystems rebounded after the asteroid impact.

Geography plays a role in how the small mammals adapt to environmental changes.

The agency plans to stop funding virtually all toxicology studies in mammals by 2035.

Researchers isolate roundworm DNA from animal excrement that is about 17,000 years old.

Researchers use a CRISPR-Cas9 strategy to expand a desired trait from 50 percent of mouse pups to about 72 percent.

Researchers describe the remains of a clutch of extinct mammal-like animals.

It’s the first demonstration of the technology in mammals.