The two-inch snail darter became a symbol for regulatory overreach in the 1970s. New research suggests the fish was not an endangered species — or even a species.

Nearly a quarter of the world's freshwater species are at risk of extinction due to a multitude of threats, according to new research.

These Incredible Organisms Are on the Brink of Extinction The clock is ticking for many of the world’s most extraordinary ...

RENO, Nev. — Responding to a Center for Biological Diversity petition, the U.S. Fish and Wildlife Service today proposed ...

Federal wildlife officials on Tuesday moved to add the monarch butterfly to its endangered species roster, citing decades of steep population decline of the striking black-and-orange insect.

They would become the most commonly seen species to receive federal protection if the proposal is adopted. By Catrin Einhorn Federal wildlife officials proposed on Tuesday that monarch butterflies ...