Scientists have assessed more than 23,000 species.

Will protecting monarch butterflies under the Endangered Species Act improve their chance of surviving? Not necessarily, 2 entomologists caution.

The Ethiopian wolf – Africa’s most endangered carnivore – has been found feeding on nectar.

Hippos are hard to study and dangerous to encounter.

Private conservation groups channel huge sums of money to parks and protected areas around the world, but often have failed to protect basic rights of Indigenous people living on those lands.

Colliding with ships is a top cause of whale deaths. A new study maps the areas of highest risk, showing where proven strategies such as speed limits and new shipping routes can reduce the toll.

If social media serves as a funeral for extinct species, then Wikipedia pages have become their gravestones.

Moo Deng is a celebrity now. But 80% of her native forest has been lost.

Rainforest is fast being turned into cattle ranches.

Colorado has spectacular scenery, but it comes with wild animals, and they sometimes wander into town. A ballot measure that would ban hunting wild cats is the latest test of public views on hunting.