Nevada Fish & Wildlife Office
Pacific Southwest Region

Yosemite toad
(Bufos canorus)

Class: Amphibia
Order: Anura
Family: Bufonidae
Genus: Anaxyrus
Species: canorus
Length: approx. 3 inches
Lifespan: up to 15 years
Feed: beetles, flies, ants, centipedes, millipedes, etc. Larave probably eat minute plant material, detritus, etc.
Habitat: temperate grassland, rivers, intermittent rivers, swamps, freshwater lakes, freshwater marshes, and tundra wetlands
 

Official Status:

Proposed Threatened
 

Life History:

Robust and stocky with dry, uniformly warty skin. No cranial crests. Large, flat oval paratoid glands. Eyes are closely set, pupils are horizontal. Dorsal stripe is very faint or absent. Sexes are colored differently. Males are pale yellowish green or olive above, with few or no dark blotches. Females and young are heavily blotched on a light background. Throat and belly is pale on both sexes. Moves by walking instead of hopping.

Inactive in cold temperatures and hot, dry weather. Primarily diurnal; frequents sunny open sites. Emerges from underground retreats soon after snow melt and is most active April-October (Stebbins 1985). Active above ground for only about 4 months each year. At Tioga Pass Meadow, emerges from hibernation in May or June (Kagarise Sherman and Morton 1993).

 

Distribution and Habitat:

 

Yosemite toads ( Bufo canorus ) are endemic to the Sierra Nevada, California, from Ebbetts Pass, Alpine County to the Spanish Mountain area, Fresno County (Karlstrom, 1962, 1973; Stebbins 1966; unpublished Sierra National Forest survey data, 1995, 2002). Sites occur from 1,950–3,444 m elevation, with the majority of sites between 2,590–3,048 m (Karlstrom, 1962). Jennings and Hayes (1994a) estimate that populations have disappeared from 50% of historically reported sites, although the overall range of the species may have only contracted in the far north and in western Fresno County. Disappearances have been concentrated at lower elevation sites on the western edge of the range, with greater persistence at higher elevation sites (Davidson et al., 2002).

 

Threats:

 

habitat loss, a fungus known as a chytrid which is easily spread through watersheds

 

Actions / Current Information:

 

Date Citation Page Title
Candidate Notice of Review Documents (Showing 5 of 8: view all ) Date Citation Page Title
11/09/2009 74 FR 57803 57878 Review of Native Species That Are Candidates for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions
12/10/2008 73 FR 75175 75244 Review of Native Species That Are Candidates for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions; Proposed Rule
12/06/2007 72 FR 69033 69106 Review of Native Species That Are Candidates for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions; Proposed Rule
09/12/2006 71 FR 53755 53835 Review of Native Species That Are Candidates or Proposed for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions
05/11/2005 70 FR 24869 24934 Endangered and Threatened Wildlife and Plants; Review of Native Species That Are Candidates or Proposed for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions; Proposed Rule

» Federal Register Documents

Most Recent Federal Register Documents (Showing 5 of 10: view all ) Date Citation Page Title
11/09/2009 74 FR 57803 57878 Review of Native Species That Are Candidates for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions
12/10/2008 73 FR 75175 75244 Review of Native Species That Are Candidates for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions; Proposed Rule
12/06/2007 72 FR 69033 69106 Review of Native Species That Are Candidates for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions; Proposed Rule
09/12/2006 71 FR 53755 53835 Review of Native Species That Are Candidates or Proposed for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions
05/11/2005 70 FR 24869 24934 Endangered and Threatened Wildlife and Plants; Review of Native Species That Are Candidates or Proposed for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions; Proposed Rule

» Conservation Plans

No conservation plans have been created for Yosemite toad

» Petitions

Most Recent Petition Findings (Showing 2 of 2) Date Citation Page Title Finding
12/10/2002 67 FR 75834 75843 Endangered and Threatened Wildlife and Plants; 12-month Finding for a Petition To List the Yosemite Toad
  • Notice 12 month petition finding, Warranted but precluded
  • 10/12/2000 65 FR 60607 60609 August 6, 2013a Petition To List the Yosemite Toad as Endangered
  • Notice 90-day Petition Finding, Substantial
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    Last updated: April 16, 2014