Endangered mammals include the Amur leopard, black rhino, cross river gorilla, mountain gorilla and the Sumatran orangutan. These are all critically endangered, according to the World Wildlife Foundation.
The Amur leopard lives in eastern Russia and as of July, 2015, there were only about 60 of these animals left in the world. Other names for this large cat include the Manchurian leopard or the Korean leopard.
The black rhino faces extinction due to hunting. There are only around 4,800 left in the world and wildlife organizations are fighting hard to save this animal.
The cross river gorilla lives in the rainforests of Nigeria and Cameroon and are concentrated in an area of around 3,000 square miles. The WWF estimates that there are only between 200 and 300 of these mammals left in the world.
The mountain gorilla lives in the Virunga Mountains in the Democratic Republic of Congo, as well as in Uganda and Rwanda. Estimates put this gorilla's number at around 880 as of July, 2015. It's at risk of extinction due to hunting, habitat destruction and disease.
The Sumatran orangutan lives in tropical and subtropical forests and rarely ever leaves the trees of its habitat. These large mammals grow to weigh between 66 and 200 pounds and due to habitat loss, their numbers have dwindled to around 7,300 individuals.
Other endangered mammals include the South China tiger, Sumatran elephant, western lowland gorilla, African wild dog, black-footed ferret and the black spider monkey.