An endangered species is defined by the U.S. Fish & Wildlife Service as "an animal or plant species in danger of extinction throughout all or a significant portion of its range." In the United States, these animals can be listed under and protected by the Endangered Species Act. Endangered Species in the United States include the black-footed ferret and the California red-legged frog. The International Union for Conservation of Nature also keeps a Red List of Threatened Species, the most widely recognized list of endangered and threatened species. On this list, for example, are all the surviving subspecies of tiger, which range from endangered to critically endangered.
Researchers have tagged more than 100 blue whales off the California Coast, finding the behemoths feed around major shipping lanes.
A river teeming with spawning salmon lures grizzly bears from hundreds of miles away, new research suggests.
The Indus River dolphin range has declined dramatically as a result of dams that have fragmented their native habitat, new research finds.
This summer, Hawaii's endangered wildlife will be on candid camera, as two kinds of drones survey the numbers and whereabouts of animals in their natural habitats.
After returning to the lower Colorado River in 2012 after a 22-year absence, the endangered razorback sucker fish is now spawning in Grand Canyon National Park.
Bison went extinct in Europe nearly 100 years ago, but conservationists are taking small steps to bring the animals back into the wild.
Sharks and rays are some of the world’s most threatened animals, with a quarter of all species at risk of extinction.
Young sea turtles don't always follow the path that scientists expected the animals to travel, with many dropping out of ocean currents into the still waters of the Sargasso Sea.
A surge in popularity of horse ownership in China's Sichuan Province threatened the Giant Panda. Only 1,600 pandas live in the wild.
A threatened species of owl is losing a turf war in the Pacific Northwest. Northern spotted owls are getting edged out of their already declining habitat by invading barred owls, a new study finds.
Lemurs have captured the public imagination in movies such as "Madagascar," but these adorable primates are on the brink of extinction, conservationists say.
An independent panel of experts said Friday there are flaws in the science the Fish and Wildlife Service (FWS) used to make its case for ousting gray wolves from the Endangered Species list.
The Southwest's small population of endangered Mexican wolves, once driven to the brink of extinction, has increased for the fourth year in a row, according to the U.S. Fish and Wildlife Service.
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