|United States range of A. woodhousii|
Bufo woodhousii Girard, 1854
Woodhouse's toad (Anaxyrus woodhousii) is a medium-sized (4 inches or 10 centimetres) true toad native to the United States and Mexico. There are three recognized subspecies. A. woodhousii tends to hybridize with Anaxyrus americanus where their ranges overlap.
Woodhouse's toad was first described in 1854 by the French herpetologist Charles Frédéric Girard. He gave it the name Bufo woodhousii in honor of the American physician and naturalist Samuel Washington Woodhouse. The large genus Bufo was split by Frost et al. in 2006, with the North American species being included in the genus Anaxyrus and this toad becoming A. woodhousii. There are three recognised subspecies:
- Southwestern Woodhouse's toad – Anaxyrus woodhousii australis (Shannon & Lowe, 1955)
- Rocky Mountain toad – Anaxyrus woodhousii woodhousii (Girard, 1854)
- East Texas toad – Anaxyrus woodhousii velatus
Woodhouse's toad is a robust amphibian and can grow to a maximum snout-vent length of 127 mm (5 in). The head has prominent cranial crests in front of and in between the eyes. The parotoid glands are long and large. The dorsal surface of this toad is grayish-brown or yellowish-brown and it is speckled with small dark spots. There is a narrow pale line running along the spine. The belly is rather paler and is usually unspotted. The male has a single vocal sac on his throat. His call resembles the bleat of a sheep and lasts from one to three seconds.
Distribution and habitat
Woodhouse's toad is found in North America at altitudes of up to 2,500 metres (8,200 ft). Its range extends from Mexico in the south to Washington in the north. In the United States it is found in Arizona, California, Colorado, Idaho, Kansas, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, Oregon, South Dakota, Texas, Utah and Washington. In the western part of its range it is typically found in lowland riparian corridors, wooded land besides streams and rivers. At higher altitudes it inhabits wet meadows, ponds, reservoirs and lakes. It is also found in urban environments, canals, ponds and irrigated agricultural land.
Woodhouse's toad is nocturnal and feeds on insects and other small invertebrates. Near human habitations these frogs may congregate underneath outside lights to feed on the insects they attract. Breeding takes place at different times of year in different parts of the range. The males call from in, or close to, standing water and the eggs are laid in gelatinous strings in still-water habitats such as ditches, ponds, pools, cattle tanks and lakes. The tadpoles typically take from five to eight weeks to reach metamorphosis.
Woodhouse's toad has a very wide range and presumed large total population. It is able to live in a number of types of habitat and can tolerate some modification to its habitat. The population seems steady and no particular threats have been identified so the International Union for Conservation of Nature has assessed it as being of "least concern". In central Arizona it seems to be displacing the Arizona toad, (Anaxyrus microscaphus).
- Hammerson, G; Santos-Barrera, G. (2004). "Anaxyrus woodhousii". IUCN Red List of Threatened Species. Version 2014.2. International Union for Conservation of Nature. Retrieved 2014-10-09.
- Beltz, Ellin (2006). "Woodhouse, Samuel Washington". Scientific and Common Names of the Reptiles and Amphibians of North America - Explained. Retrieved 2014-11-17.
- Howard Clark. "Arizona toad (Anaxyrus microscaphus)". Tucson Herpetological Society. Retrieved 2014-11-16.
- "Order Anura: Frogs and Toads". Checklist of Amphibian Species and Identification Guide. USGS. 2013-02-02. Retrieved 2014-11-17.
- Jim Rorabaugh. "Woodhouse's toad (Anaxyrus woodhousii)". Tucson Herpetological Society. Retrieved 2014-11-17.
- "Woodhouse's Toad, Bufo woodhousii". Checklist of Amphibian Species and Identification Guide. USGS. Retrieved 2014-11-17.
- Brian K. Sullivan (2005). "Anaxyrus woodhousii". AmphibiaWeb. Retrieved 2014-11-15.
- Frost, D. R.; Grant, T.; Faivovich, J. N.; Bain, R. H.; Haas, A.; Haddad, C. L. F. B.; De Sá, R. O.; Channing, A.; Wilkinson, M.; Donnellan, S. C.; Raxworthy, C. J.; Campbell, J. A.; Blotto, B. L.; Moler, P.; Drewes, R. C.; Nussbaum, R. A.; Lynch, J. D.; Green, D. M.; Wheeler, W. C. (2006). "The Amphibian Tree of Life". Bulletin of the American Museum of Natural History. 297: 1–291. doi:10.1206/0003-0090(2006)297[0001:TATOL]2.0.CO;2. hdl:2246/5781.
- Pauly, G. B.; Hillis, D. M.; Cannatella, D. C. (November 2004). "The History of a Nearctic Colonization: Molecular Phylogenetics and Biogeography of the Nearctic Toads (Bufo)". Evolution. 58 (11): 2517–2535. doi:10.1554/04-208. PMID 15612295.
- "Anaxyrus woodhousii". Integrated Taxonomic Information System. Retrieved 9 October 2014.
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