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.
Over the last 24 hours, Sudan's health declined to the point where he was suffering a great deal and unable to walk.
With the last northern white rhino named Sudan standing on his last leg, conservationists are debating whether his subspecies has a chance at survival.
The orangutan lives on Sumatra, south of a lake in the caldera of a supervolcano. There are fewer than 800 individuals in the population, researchers say.
Must the money raised to save wildlife always aid the most popular animals? New research suggests that marketing can persuade donors that northern hairy-nosed wombat lives matter too.
The species, which haven't been seen for years or decades, include pink-headed ducks, red-thighed monkeys and a seahorse no one's ever seen in the wild.