Top Ten Most Endangered Species

The Pacific walrus relies on Arctic sea ice throughout the year for breeding, nursing calves, traveling and resting between dives for food. The rapid loss of sea ice due to global warming greatly threatens the survival of the Pacific walrus.

The Magellanic penguin is most closely related to the African penguin, the Galapagos penguin and the Humboldt penguin which it is similar in appearance to. Despite being classed as a threatened species, the Magellanic penguin is one of the most numerous of all of these types of penguin.

Leatherback turtles are named for their shell, which is leather-like rather than hard, like other turtles. They are the largest sea turtle species and also one of the most migratory, crossing both the Atlantic and Pacific Oceans.

There are three species of bluefin: Atlantic (the largest and most endangered), Pacific, and Southern. Most catches of the Atlantic bluefin tuna are taken from the Mediterranean Sea, which is the most important bluefin tuna fishery in the world.

The critically endangered mountain gorilla population is threatened by habitat loss, poaching, disease and war. Learn more about what WWF is doing to protect its future, and how you can help. Learn more about what WWF is doing to protect its future, and how you can help.

Protect endangered species, including the monarch butterfly, at World Wildlife Fund. Learn about the ways WWF works to conserve a future where people live in harmony with nature. Protect endangered species, including the monarch butterfly, at World Wildlife Fund.

Javan rhinos are the most threatened of the five rhino species, with only 58-68 individuals that live only in Ujung Kulon National Park in Java, Indonesia. Javan rhinos once lived throughout northeast India and Southeast Asia. Vietnam’s last Javan rhino was poached in 2010.

The giant panda is the rarest member of the bear family and among the world’s most threatened animals. Learn about WWF's giant panda conservation efforts.

Habitat destruction is a concern for all four gorilla subspecies. WWF has worked to designate new protected areas for gorillas in many places, like in Cameroon, where gorilla sanctuaries would provide havens for the rare cross river gorilla as well as the western lowland gorilla.

Sumatran Rhino The Sumatran rhino is possibly the most endangered large mammal on the planet, with fewer than 100 surviving in fragmented sub-populations across Indonesia on the islands of Sumatra and Borneo. The remaining populations of Sumatran rhinos are small and isolated, limiting reproduction in the wild.