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Frogs and Toads on the Decline


"Boreal toad. Photographer: Stephen Corn, USGS. Boreal toad (Bufo boreas boreas) from Rocky Mountain National Park, Colorado (federal candidate species; listed as endangered by the state of Colorado; the species has undergone about an 80 percent decline in the southern Rocky Mountains)."
 

"The Chiricahua leopard frog is absent from about 80 percent of its historical localities in the United States. Photo by Cecil Schwalbe, USGS; photo taken at Buenos Aires National Wildlife Refuge, Ariz., July 1994."
 

"Northern cricket frog. Photographer: Allen Sheldon. The cricket frog has disappeared from the northern portions of the Midwest for unknown reasons."
 

"Northern leopard frog. Photographer: Mike Lannoo. Leopard frogs are a common species in the Midwestern U.S., but in certain locations can exhibit deformities. The exact cause of these deformities in the Midwest is still under investigation."
 

"Northern Leopard frog. Photographer: C. Drost, USGS."
 

"Red-legged frog. Photo by M.R. Jennings, UGSG"


Related Resources
Declining Amphibian Populations
Images of U.S. amphibians that are on the decline.

Biology Forum
Discuss and debate issues concerning biology.




Source: U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA.


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