Researchers pulled a coelacanth caught in 1960 from its jar of alcohol in a museum and gave it an MRI. Doing so reveals some of the fish's mysterious ways.

Fernanda the tortoise is the only of her species discovered on the Galápagos island of Fernandina since 1906. She has baffled evolutionary biologists.

After an entanglement with fishing gear, most North Atlantic right whales die witin three years. Estimates say there are fewer than 350 left in the wild.

A new study highlights another threat facing endangered koalas, but could also lead to ways to treat populations and reduce the risk of extinction.

"Tiger deaths along the roads and railways would reduce the tiger population from around 130 animals to just 50 animals over a 20-year period."

A new study of decreased genetic diversity in the immune system of the Wyoming toad could lead to new captive breeding strategies for endangered species.

The North Atlantic right whale is one of the most endangered whales in the world. A new welfare assessment tool may help draw attention to the problem.

Researchers assessed 45,000 marine species and all the threats known across the planet to find those ocean creatures most at risk.

Researchers assessed 45,000 marine species and all the threats known across the planet to find those ocean creatures most at risk.

Threatened birds have disappeared from almost 70% of Australia—and 10 birds have become locally extinct from 99% of their historical habitat.