Parameter Tree:
EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > ENDANGERED SPECIES

Definition:
An endangered species is a species in imminent danger of extinction
throughout all or a significant portion of its range. 


Reference:
Meffe, Gary K. and C. Ronald Carroll. Principles of Conservation Biology.-2nd
ed. 1997. Sinauer Associates, Inc. Sunderland, Massachusetts.