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.

Species with larger pancreatic cells tend to have shorter lives, according to a study.  

While shifts in behavior could help wildlife and people coexist, they might also affect the animals’ survival.