What Are Some of the World's Most Endangered Species?

Among the most threatened species of animals worldwide are the ivory-billed woodpecker, Amur leopard, North Atlantic right whale, black rhino, Javan rhino, mountain gorilla, Cross River gorilla, tiger (including all subspecies), Sumatran elephant and Sumatran orangutan. These animals have become endangered due to dwindling habitat, overhunting and climate change.

The estimated numbers remaining in each of these critically endangered species vary; scientists estimate that only 60 Amur leopards survive, while several hundred animals of the other species remain. Scientists have mounted efforts to breed and protect endangered species, and the World Wildlife Fund keeps an online, updated list of the most critically endangered animals worldwide.