Gold dots and blue squares indicate where native frogs are presumed extinct. It appears to be on the verge of extinction in California. It has not been seen in the state since the mid-1960's and now seems to be extinct at all sites examined. Most localities where this frog was historically found have not changed appreciatively during the past 50 years, so the reasons for the species' decline and disappearance remain a mystery. Historical and current distribution of the mountain yellow-legged frog, and presumed native populations of the northern leopard frog in California based on 2,565 museum records and 673 records from other sources.
Dots indicate locality records based on verified museum specimens.
Red dots and green squares denote localities where native frogs are extant. Gold dots and blue squares indicate where native frogs are presumed extinct. Bradford, D.F. 1991. Mass mortality and extinction in a high elevation population of Rana muscosa . Bradford, D.F., D.M. Graber, and F. Tabatabai. 1993.