Species Focus Area
Mammals shape landscapes through grazing, digging, seed spreading, and predation. Many need large, connected range to survive at all, which makes them early casualties of fragmentation.
Large and medium mammals hold ecosystems in balance from the top down. Losing them changes vegetation, prey populations, and soil long after the animal itself is gone.
Common threats
How people can help
These ten are not a scientific ranking. They were selected for conservation urgency, teaching value, and regional relevance, and each one has a complete, sourced profile.
Critically Endangered (IUCN) / Endangered (ESA)
Canis rufus
Declared extinct in the wild in 1980 and rebuilt from fourteen founder animals; the only wild population lives in eastern North Carolina.
Least Concern (IUCN) / Endangered (ESA)
Leopardus pardalis
Secure across Latin America but nearly gone from the United States, where a few dozen cats survive in south Texas thornscrub.
Endangered (ESA, subspecies)
Canis lupus baileyi
The most endangered gray wolf subspecies in North America, restored to Arizona and New Mexico from seven founders.
Endangered (IUCN and ESA)
Mustela nigripes
North America's only native ferret, twice believed extinct, entirely dependent on prairie dog colonies for food and shelter.
Endangered (ESA, subspecies)
Puma concolor coryi
The last breeding puma population in the eastern United States, recovered from near-collapse by a 1995 genetic rescue using Texas cougars.
Critically Endangered (IUCN)
Manis javanica
A scaled, ant-eating mammal of Southeast Asia driven toward extinction by the most intense illegal wildlife trade of any mammal group.
Critically Endangered (IUCN, subspecies)
Panthera pardus orientalis
A cold-adapted leopard of the Russian Far East and northeast China, reduced to a single small population and now slowly increasing under strict protection.
Critically Endangered (IUCN)
Loxodonta cyclotis
Recognized as a distinct species in 2021 and immediately assessed as Critically Endangered after decades of ivory poaching in Central African forests.
Critically Endangered (IUCN)
Pongo abelii
A critically endangered great ape confined to northern Sumatra, losing habitat to oil palm expansion, logging, and road development.
Endangered (IUCN and ESA)
Leptonycteris nivalis
A migratory nectar-feeding bat that pollinates agaves along a corridor from central Mexico to the mountains of west Texas.