Incilius alvarius 

Scope: Global
Language: English

Translate page into:

Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Anura Bufonidae

Scientific Name: Incilius alvarius (Girard, 1859)
Common Name(s):
English Colorado River Toad
Bufo alvarius Girard, 1859
Taxonomic Source(s): Frost, D.R. 2013. Amphibian Species of the World: an Online Reference. Version 5.6 (9 January 2013). Electronic Database. American Museum of Natural History, New York, USA. Available at:

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2004
Date Assessed: 2004-04-30
Needs updating
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).
Countries occurrence:
Mexico; United States
Additional data:
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.
Current Population Trend:Stable
Additional data:
Population severely fragmented:No

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 2004: e.T54567A11152901. . Downloaded on 21 September 2018.
Disclaimer: To make use of this information, please check the <Terms of Use>.
Feedback: If you see any errors or have any questions or suggestions on what is shown on this page, please provide us with feedback so that we can correct or extend the information provided