The Southern Corroboree Frog is Australia's most critically endangered frog species, probably because of a disease caused by the Amphibian Chytrid Fungus. The fungus is thought to have entered Australia on frogs used in laboratory testing and is killing millions of amphibians around the world. Without a successful captive breeding and release program, this species will be extinct within five to 10 years, but breeding this species has proven very difficult.
The Hatinh Langur is a critically endangered primate species in Central Vietnam. Past hunting techniques have left the population of Hatinh Langurs fragmented, living in small isolated groups, which increases the risk of inbreeding and disease.