Hunting enthusiasts moved species like muskoxen and mountain goats to new environments, but their survival in those faraway lands may help animals in other areas.

Animal-rights activists come together in San Diego to stand up for tortured animals and hope others will follow.

Western monarchs face myriad threats. A network of advocates is doing everything they can to mitigate the dangers and unravel mysteries about monarch movements and behavior.

These new comics collections use satire, poetry, and science to shine a light on human failures — and who and what we need to save.

Home to important plant and animal species, this mountain and its spectacular views face threats from climate change, wildfires, and the border wall.

Experts say the growing commercial trade in wild, threatened species like corals is unacceptable and irresponsible.

From tiny seeds come big results: replanting seagrass meadows that help fish, protect coastlines, and absorb climate-heating carbon dioxide.

Scientists also declared several other extinctions, including the first documented plant extinction in New Hampshire.

The Trump administration has already rolled back planned limits on PFAS chemicals, which have been linked to cancer and other health problems.