The term, endangered species, refers to a species whose numbers are so small that the species is at risk of extinction throughout all or a significant portion of its range.
 
 
Recommended Resources
Asiatic Lion Information Center
Also known as the Indian Lion, the Asiatic Lion is a sub-species that once ranged from Greece to central India, and has played a significant role in the symbols and folklore of Indian culture for more than two thousand years, but which currently exists only in the Gir National Park and the Lion Sanctuary, both established by the government of India. An overview of the species is presented, along with photographs and information about steps that have been taken to save the beast from extinction.
http://www.asiatic-lion.org/
Black-Footed Ferret Recovery Program
The black-footed ferret is thought to be one of the most endangered mammals in the world. Facts about the species are discussed here, including its history, decline, and recovery strategies, one of which is its reintroduction into the wild, as well as the prairie ecosystems required by the animal.
http://www.blackfootedferret.org/
Conservation Breeding Specialist Group
The function of the CBSG is to save threatened species through improvement of conservation efforts worldwide through interdisciplinary methodologies, culturally sensitive facilitation and global partnerships and collaborations. Its history and mission are described, with information about how others can help, along with news and schedules of its programs, workshops and documents.
http://www.cbsg.org/
The ESC is a national network of conservation, scientific, educational, religious, sporting, outdoor recreation, and community organizations interested in protecting endangered species and their habitats, particularly within the United States. Its membership policies are discussed.
http://www.stopextinction.org/
Endangered Species International
The staff of ESI include endangered species experts, scientists, conservation awareness and communication leaders who develop conservation science, implement this research in field projects around the world, and advocate for local, national and global policy change. Its projects and specific species are discussed here.
http://www.endangeredspeciesinternational.org/
Smithsonian National Zoological Park: Endangered Species Science
The focus of this site is on those species that are at immediate risk of going extinct, presenting a description of the terms, a discussion of the science of captive breeding populations, managing small populations in captivity, and specific information about many species that are currently considered to be endangered.
http://nationalzoo.si.edu/SCBI/endangeredspecies/default.cfm