California Reptiles & Amphibians

Bufo boreas halophilus - California Toad

(=Anaxyrus boreas halophilus - Southern California Toad)

Click on a picture for a larger view

Range in California: Red

Click the map for a guide
to the other subspecies.

Listen to this toad:

One short call

More sounds of
Bufo boreas halophilus

Adult, San Bernardino County

Sub-adult, San Bernardino County

Adult, Riverside County

Adult, Borrego Valley, San Diego County

Sub-adult, Stanislaus County

Adult from Afton Canyon, San Bernardino County

These three adult toads were photographed at night as they sat on the vegetation of a small pond in Los Angeles county.

Adult, Riverside County

Adult, Stanislaus County

Adult, Darwin Falls, Inyo County

This tiny juvenile toad was found at Darwin Falls, Inyo County, where hypbrids with Red-spotted Toads - Bufo punctatus have been found. While it resembles a California Toad, it appears to be a hybrid since it lacks a dorsal stripe and has less oval and more rounded parotid glands, similar to the Red-spotted Toad. © Ceal Klingler

Adult, San Diego County

Adult, Riverside County

Sub-adult, Stanislaus County - showing bright pads on bottom of feet.

Adult, possible intergrade with
B. b. boreas, Shasta County

Toads usually move by walking or crawling, while true frogs typically hop.

Close-up showing large oval parotoid
glands behind the eyes.

Congregation of breeding adults, February, Contra Costa County
© Joyce Gross

Amplexing adults, Kern County
© Henk Wallays

Adults in amplexus , Orange County
© Jason Jones

Male toads in a breeding pond, apparently attempting to amplex a catfish in Alameda County. © Andy Hatch

Sub-adult, Riverside County

Fully metamorphosed toadlet

Newly metamorphosed toadlet with some tail remaining, Contra Costa County

After transforming from tadpoles, thousands of tiny toad metamorphs can often be found around the banks of breeding ponds. Contra Costa County

Eggs and Tadpoles

Tadpoles in breeding pond,
Contra Costa County

Tadpoles, San Bernardino County

Tadpole in pond, Contra Costa County

Tadpole in water, Contra Costa County

Mature tadpole with hind legs, in water, Contra Costa County

Mature tadpole with four legs, in water
Contra Costa County

Egg strings on pond, Orange County
© Jason Jones

Habitat

Habitat, desert river wetlands, Afton Canyon, San Bernardino County

Habitat, desert spring, Darwin Falls, Inyo County

Habitat, Los Angeles County pond

Habitat, cattle pond in oak grassland, 1,400 ft., Contra Costa County

Habitat, San Bernardino County creek

Habitat, pond in Sierra Nevada Mountains, 4,500 ft., Kern County

Habitat, seasonal pool in Central Valley Grasslands, Merced County

Habitat, small creek in Coast Range foothills, 500 ft., Stanislaus County

Habitat, wetlands at 2,000 ft., Santa Rosa Plateau, Riverside County

Desert riparian habitat, San Diego County

Habitat, San Bernardino County creek

Short Video

This toad moves across the wet ground both by crawling and by hopping.

Description

Size

Adults grow to 2 - 5 inches from snout to vent ( 5.1 - 12.7 cm).

Appearance

Large and robust with dry, warty skin. No cranial crests. Oval parotoid glands. Tarsal fold is well-developed. Pupils are horizontal. Coloring is greenish, tan, reddish brown, dusky gray, and yellow above with a light-colored stripe down the middle of the back. Warts are often rusty and set on dark blotches. Males are usually less blotched than females and have smoother skin. Male and female throats are pale. Young have no dorsal stripe immediately after transformation.
There are fewer dark blotches on the belly than on B. b. boreas. The head is also wider with larger eyes with less distance between the upper eyelids and the feet are also smaller than B. b. boreas. (Stebbins)

Voice (Listen)

Male California Toads do not have a pronounced vocal sac, but they do make a call during breeding aggregations. Their call has been described as a high-pitched plinking sound, like the peeping of a chick, repeated seveal times. The sound of a group of males calling has been compared to the sound of a distant flock of geese.

Calls are produced at night and during the day during the short breeding season. Males make their call primarily when they are in close contact with other males. Rather than being advertisement calls made to attract females, these calls are generally considered encounter or aggressive calls, or release calls, which serve to maintain territory and spacing between males. The calls may also serve other purposes - a lone male toad has been observed calling.1 It could also be possible that female toads are attracted to the sounds of male encounter calls, and can judge a male's condition by his call, similar to the function of an advertisement call.

Unreceptive females may also produce a release call when grasped on the back by a male. Males and females sometimes make a release call when grabbed across the back by a human hand.

Behavior

Diurnal and nocturnal. Often diurnal after winter emergence, becoming nocturnal in the summer after breeding.
Toads are not territorial except when breeding. Amplexing males will kick away other males, and males may briefly fight other males at breeding sites.
For defense, this toad relies on parotoid glands and warts which can secrete a poison that deters some predators. Other predators are immune to the poison, and will consume toads. Still other predators such as ravens have learned to avoid the poisons by eating only their viscera through the stomach.
Slow moving, often with a walking or crawling motion along with short hops.
Toads have been reported living at least 9 years.

Diet

Diet consists of a wide variety of invertebrates. The prey is located by vision, then the toad lunges with a large sticky tongue to catch the prey and bring it into the mouth to eat. Tadpoles consume algae and detritus, including the scavenged carrion of fish and other tadpoles.

Reproduction and Young

Reproduction is aquatic. Fertilization is external. Adults are mature enough to breed when they are 4 - 6 years old. They breed shortly after they emerge from their hibernation sites and migrate to the breeding wetlands, using scent cues to find their way. In some areas, breeding occurs after snowmelt when breeding ponds refill with water. Mating and egg-laying can occur any time from January to early July, depending on the elevation and winter snow levels.

Egg-laying takes place in still or barely moving waters of seasonal pools, ponds, streams, and small lakes.
Eggs are laid in long strings with double rows, averaging 5,200 eggs in a clutch. Fresh eggs contain some of the toads toxin to protect them from predation, but this poison decreases over time. Eggs hatch in 3 to 10 days, often longer in the colder waters of higher elevations.

Large schools of tadpoles often feed in shallow water. Tadpoles are dark brown, and grow to about 1 inch in length before metamorphosis. Tadpole development also depends on water temperature; tadpoles enter metamorphosis in 30 - 45 days, usually in late summer or early fall. In years of extreme winter weather, this might be only a few weeks before snow begins to accumulate again. When in the process of metamorphosis, many tadpoles are often seen in aggregations at the edge of a pond. Large numbers of newly-transformed toads are often seen hopping around the shores of breeding water. They may stay and spend the winter at the border of their natal wetland, or they may disperse to nearby sites away from the pond.

Range

This subspecies ranges throughout most of California, from the northern forests east into west central Nevada, and south through most of the state east of the deserts, into northern Baja California. Not present in most of the central high Sierra Nevada mountains where B. canorus is present, except south of Kaiser Pass, Fresno county. Isolated desert wetlands populations include Afton Canyon, Darwin Falls, Grapevine Canyon, the Newberry Mountains, and California City, where the toads were probably introduced.

Habitat

Inhabits a variety of habitats, including marshes, springs, creeks, small lakes, meadows, woodlands, forests, and desert riparian areas. In the spring and early summer, toads are often found at the edge of water, sometimes basking on rocks and logs. At other times of the year they are also found farther from the water where they spend much of their time in moist terrestrial habitats.Toads use rodent holes, rock chambers, and root system hollow as refuges from heat and cold.
Bufo boreas is found from sea level to over 11,800 ft. (3,600 m.)

Taxonomic Notes

Two subspecies of Bufo boreas are recognized in California -Bufo boreas halophilus, and Bufo boreas boreas.
(Bufo nelsoni has also been treated as a subspecies of Bufo boreas: B. b. nelsoni, but this is controversial.)
Bufo boreas halophilus has been renamed Anaxyrus boreas halophilus, but this nomenclature is not yet standard.

Conservation Issues (Conservation Status)

Bufo boreas is becoming uncommon in many areas of the Pacific Northwest, the Rocky Mountains and other areas, probably due to environmental changes caused by habitat loss, especially loss of wetlands, and chemical contamination of wetlands. Toads are also slow-moving and are frequently run over by traffic as they cross roads at night during their breeding migrations, which could also contribute to their loss.

Taxonomy
Family	Bufonidae	True Toads
Genus	Bufo	True Toads
Species	boreas	Western Toad
Subspecies	halophilus	California Toad
Original Description
Bufo boreas Baird and Girard, 1852 - Proc. Acad. Nat. Sci. Philadelphia, Vol. 6, p. 174 Bufo boreas halophilus Baird and Girard, 1853 California Toad from Original Description Citations for the Reptiles and Amphibians of North America © Ellin Beltz
Meaning of the Scientific Name
Bufo - Toad Boreas - Greek meaning north wind or northern - which refers to the northern range Halos - Greek - sea, salt Philos - Greek - having an affinity for - refers to its coastal distribution from Scientific and Common Names of the Reptiles and Amphibians of North America - Explained © Ellin Beltz
Alternate Names
Anaxyrus boreas halophilus - Southern California Toad
Related or Similar California Frogs
Bufo boreas boreas Bufo californicus Bufo woodhousii Bufo canorus Bufo exsul
More Information and References
Natureserve Explorer California Dept. of Fish and Game AmphibiaWeb Stebbins, Robert C. A Field Guide to Western Reptiles and Amphibians. 3rd Edition. Houghton Mifflin Company, 2003. Behler, John L., & F. Wayne King. The Audubon Society Field Guide to North American Reptiles and Amphibians. Alfred A. Knopf, 1992. Bartlett, R. D. & Patricia P. Bartlett. Guide and Reference to the Amphibians of Western North America (North of Mexico) and Hawaii. University Press of Florida, 2009. Elliott, Lang, Carl Gerhardt, and Carlos Davidson. Frogs and Toads of North America, a Comprehensive Guide to their Identification, Behavior, and Calls. Houghton Mifflin Harcourt, 2009. Lannoo, Michael (Editor). Amphibian Declines: The Conservation Status of United States Species. University of California Press, June 2005. Wright, Anna. Handbook of Frogs and Toads of the United States and Canada. Cornell University Press, 1949. Davidson, Carlos. Booklet to the CD Frog and Toad Calls of the Pacific Coast - Vanishing Voices. Cornell Laboratory of Ornithology, 1995.

Conservation Status
The following status listings come from the Special Animals List which is published several times each year by the California Department of Fish and Game. This toad is not on the Special Animals List. There are no significant conservation concerns for it in California.`
Organization	Status Listing
U.S. Endangered Species Act (ESA)
California Endangered Species Act (CESA)
California Department of Fish and Game
Bureau of Land Management
USDA Forest Service
Natureserve Global Conservation Status Ranks
World Conservation Union - IUCN Red List

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