1. Crocodylus rhombifer
With the most restricted range of any crocodilian, the Cuban crocodile is in danger of extinction due to habitat alteration, hunting, and competition with introduced caimans.
2. White-headed langur
Only 59 of these monkeys remain on a small island off Vietnam.
3. Romer's Tree Frog
Less than 0.8 inches long, the Romer’s tree frog of Hong Kong was once thought to be extinct following airport construction that wiped out its habitat. In good news, this tree frog is still alive, with active breeding programs contributing to a couple thousand Romer’s being released in the wild in the 1990s.
4. Przewalski's horse
With its stocky body and short neck, Przewalski's horseis the only true living species of wild horse. In recent yearsit has been reintroduced into native habitats in Mongolia following dedicated conservation efforts.
5. Florida bonneted bat
Thought to be extinct in 2002, the small colony has since been discovered.
6. Green-eyed frog
Only a few hundred of these small amphibians are left.
7. Grenada dove
The national bird of Grenada is threatened by habitat loss.
8. Hirola/Hunter's hartebeest
The hirola is a highly threatened African antelope.
9. Ploughshare tortoise
With only 400 left, the ploughshare tortoise is threatened by the illegal pet trade.
10. Island gray fox
Living on the California Channel Islands, this is the smallest fox in the United States.
11. Sumatran orangutan
This population has declined 80 percent during the past 75 years.
This small ocean porpoise is drowning in fishing nets.