American Cheetah
Native to north America. One of the fastest land animals.
Texas and California known to have lived in Coastal savannah, forests with open areas, and appalachian mountain stream valleys. Its ecological role: To maintain biodiversity balance..
American Cheetah went extinct about 10,000 years ago, possibly as a result of human encroachment on its territory. Sheeps, goats and other animals they preyed on came back and repopulated the areas.

Amur Leopard

Also known as Far Eastern leopard is a leopard subspecies native to the Primorye region of southeastern Russia and Jilin Province of northeast China. Its ecological role: Amur leopards hunt a very wide variety of animals including roe deer, sika deer, badgers and hares.
Amur leopards are threatened by poaching, encroaching civilization, new roads, exploitation of forests, and climate change. Methods of restoring populations Cut down poaching and other threats by funding appropriate conservation projects and educating and informing people about the importance of the Amur leopard

Black-footed ferret

Black-footed ferrets once occurred in grassland habitats throughout the Great Plains in 12 US states and 2 Canadian provinces, and possibly portions of northern Mexico. It’s a predator towards prairie dogs
For a time, the black-footed ferret was harvested for the fur trade. The large drop in black-footed ferret numbers began during the 1800s through to the 1900s, as prairie dog numbers declined because of control programs and the conversion of prairies to croplands.
Restoring large populations of prairie dogs to bring back a healthy and diverse prairie ecosystem and would be helpful in the recovery of the black footed ferrets.

Arizona, New Mexico and the Chihuahuan desert: Sky Island
In the southwestern United States and northwestern Mexico lies a region boasting the highest biodiversity in inland North America. Isolated mountain ranges topped by 10,000-foot peaks rise from intervening desert valleys and grasslands, prompting the nickname “Sky Islands.”
Some species, like the Mount Graham red squirrel, occur only in a single mountain range after evolving in isolation, surrounded by deserts; the red squirrel is just one of about two dozen species endemic to the Pinaleños, the highest of the Sky Island ranges. Various species of talus snail species are likewise limited to a single mountain range, Arizona’s Santa Rita Mountains. Such species are particularly vulnerable to threats like large-scale resource extraction and climate change, the latter of which jeopardizes the Sky Islands’ numerous perennial streams, crucial to many species’ survival. The entire home range of the Mount Graham red squirrel is threatened by a single array of large telescopes, while rare talus snails faces extinction as a result of a single open-pit copper mine proposal.
One mountain in the Sky Island region hosts more than half of all the bird species found in the United States. Less well known is the fact that the Sky Islands also host the greatest number of mammals in the U.S., as well. To remove these organisms habitat is to wipe out the organisms itself. Drastic changes will occur to our ecosystem.