Urban sprawl, dams, grazing, mining and off-road vehicles are devouring what little remains of arroyo toad habitat, while nonnative species devour the toads themselves. Once found in large numbers from Monterey to San Diego and northern Baja California, arroyo toads have disappeared from as much as 65 percent of their historic range. Reproduction is dependent upon the availability of very shallow, still, or low-flow pools in which breeding, egg-laying, and tadpole development occur. After stage 26, tan crossbars appear on the tailbase. Arroyo toad is a species of toad found only in California in the United States and Baja California in Mexico. They use streams that have slow-moving currents with shallow pools, nearby sandbars and adjacent stream terraces for breeding. A male Arroyo Toad calls three times at night from the edge of a creek in San Bernardino County. Arroyo toads are buff-colored, and their soft, high whistled trill is often mistaken for an insect’s call.

From hatching (Gosner stage 18, 4.0 mm TL) to stage 26 (10–12 mm TL) larvae are colored black. The toads are present in portions of 25 river basins in the U.S. 2) At the time of listing, arroyo toad was known as Bufo microscaphus californicus, a subspecies of southwestern toad. The arroyo toad is a small, stocky amphibian.

The species is nocturnal and remains … Arroyo toad eggs and larvae are described and illustrated in Stebbins (1951, 1985) and Sweet (1992; reprinted in USFWS, 1999a).
2006). It is a true toad. This small toad was once found throughout coastal rivers and streams from Monterey to San Diego counties, as well as in Baja California. Arroyo toads are breeding habitat specialists and require slow-moving streams that are composed of sandy soils with sandy streamside terraces (Sweet 1992, p. 23–28).

Since then, many species in the genus Bufo were changed to the genus Anaxyrus , and now arroyo toad is known as Anaxyrus californicus (Frost et al. CDFW BIOS GIS Dataset, Contact: Tony McKinney, Description: These data identify, in general, the areas where final critical habitat for the arroyo toad (Bufo californicus) occur. More. Arroyo toads have perhaps the most specialized habitat requirements of any amphibian found in California. The purpose is to provide the user with a general idea of areas where final critical habitat … Fish & Wildlife Service ECOS Environmental Conservation Online System U.S.FWS Species profile about species listing status, federal register publications, recovery, critical habitat, conservation planning, petitions, and life history U.S. In 2001 it was determined to be its own species, Bufo californicus .