Incilius alvarius


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Incilius alvarius
Species Authority: (Girard, 1859)
Common Name(s):
English Colorado River Toad
Bufo alvarius Girard, 1859

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2004
Date Assessed: 2004-04-30
Assessor(s): Geoffrey Hammerson, Georgina Santos-Barrera
Reviewer(s): Global Amphibian Assessment Coordinating Team (Simon Stuart, Janice Chanson, Neil Cox and Bruce Young)
Listed as Least Concern in view of its wide distribution, tolerance of a degree of habitat modification, presumed large population, and because it is unlikely to be declining fast enough to qualify for listing in a more threatened category.

Geographic Range [top]

Range Description: This species occurs from extreme southeastern California, southern Arizona and extreme southern New Mexico in the USA, south into Mexico. It has nearly been extirpated in California. It occurs from sea level to 1,610m asl (Stebbins 1985).
Mexico; United States
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The total adult population size for this species is unknown but surely is many thousands. It is common throughout its range.
Population Trend: Stable

Habitat and Ecology [top]

Habitat and Ecology: This species ranges from arid mesquite/creosotebush lowlands and arid grasslands to oak/sycamore/walnut groves in mountain canyons. It is often near permanent water but is also found near temporary water or far from water. It takes refuge in rodent burrows. It breeds and lays eggs in ponds, slow-moving streams, etc.
Systems: Terrestrial; Freshwater

Threats [top]

Major Threat(s): No major threats have been identified (other than localized ones) for this species.

Conservation Actions [top]

Conservation Actions: This species is found in El Pinacade Biosphere Reserve in Mexico.

Citation: Geoffrey Hammerson, Georgina Santos-Barrera 2004. Incilius alvarius. The IUCN Red List of Threatened Species. Version 2014.3. <>. Downloaded on 28 March 2015.
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