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NAL Agricultural Thesaurus and Glossary
U.S. Department of Agriculture

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rare species
Definition
A rare species, or subspecies, is one that, although not presently threatened with extinction, is in such small numbers, throughout its range, that it may be endangered if its environment worsens.
Definition Source
Schwarz, Charles F.; Thor, Edward C.; Elsner, Gary H. 1976. Wildland planning glossary. Gen. Tech. Rep. PSW-13. Berkeley, Calif.: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station
Used For
rare animals
rare plants
Spanish
especie rara