Endangered Species Act

Proposed changes to the landmark legislation would limit protections for the thousands of endangered plants and animals covered under the law.

Fifty years ago, the first species gained official federal protection as endangered. Those protections are now in danger.

Yellowstone’s grizzly bears are spreading out and expanding their range. Is it a sign of good health—or increasing desperation?

Crowdsourcing could cut conservation costs for boring, uncharismatic, or ugly species.

The U.S. government classifies all chimpanzees as endangered, after decades of stalling.