Wyoming is home to 12 amphibian species and 22 species of reptiles.

Amphibians

Tiger salamander The tiger salamander (Ambystoma tigrinum) is a species of mole salamander. Tiger salamanders are large, with a typical length of 6–8 inches. They can reach up to 14 inches in length, particularly neotenic individuals. Adults are usually blotchy with grey, green, or black, and have large, lidded eyes. They have short snouts, thick necks, sturdy legs, and long tails. Their diet consists largely of small insects and worms, though it is not rare for an adult to consume small frogs and baby mice.

In Wyoming, the salamander is found in most habitat types with a body of nonflowing water nearby for breeding.

Boreal chorus frog The boreal chorus frog, (Pseudacris maculata) is a species of chorus frog native to Canada from the west of Lake Superior to western Alberta and north to the North West Territories. It occurs in the USA throughout Montana, northwestern Wisconsin, northeastern Arizona, northern New Mexico and southwestern Utah. This is a small species of frog, reaching about 30mm in length. It is highly variable however it is normally brown, but can be green on the dorsal surface, with 3 broken dorsal stripes, these stripes can be very distinct to quite faint. There is a dark band present from the snout, through the eye and continuing down the side. It has slightly enlarged toes discs to help in climbing small grasses and vegetation.

In Wyoming, this frog is found in marshes, ponds, small lakes, up to .

Great Basin spadefoot toad The Great Basin spadefoot (Spea intermontana) is a species of toad in the family Scaphiopodidae. The natural habitats of the Great Basin spadefoot include pinyon-juniper, ponderosa pine, and high elevation spruce-fir forests, semidesert shrubland, sagebrush flats, temperate grasslands, and deserts. They are present in agricultural areas as well. The Great Basin spadefoot can be found from southern British Columbia through the eastern portions of Washington and Oregon and in southern Idaho. Their range extends throughout all of Nevada and into most of Utah; they are also present in small areas in California, Arizona, Colorado, and Wyoming.

In Wyoming, this toad is found in sagebrush communities below , west of the Continental Divide.

Plains spadefoot toad The plains spadefoot toad (Spea bombifrons) is a species of spadefoot toad which ranges from southwestern Canada, throughout the Great Plains of the western United States, and into northern Mexico. Like other species of spadefoot toad, they get their name from a spade-like projection on their hind legs which allows them to dig into sandy soils. The Plains spadefoot toad generally grows from 1.5 to 2.5 inches in length, has a round body, with relatively short legs. They vary in color from greys to browns, usually reflecting the color of the soil in their native habitat, with a white underside. Sometimes they have light striping on their back.

In Wyoming, this toad is found in grasslands and sagebrush communities below east of the Continental Divide.

Western toad

The western toad or boreal toad (Bufo boreas) is a large toad species, between 5.6 and 13 cm long, of western North America. It has a white or cream dorsal stripe, and is dusky gray or greenish dorsally with skin glands concentrated within the dark blotches.

In Wyoming, this toad occurs in wet areas in foothills, montane, and subalpine zones from .

Woodhouse's toad Woodhouse's toad, (Bufo woodhousii) is a medium-sized () true toad, which is native to the United States and Mexico. There are two recognized subspecies. The epithet woodhousii is in honor of the American physician and naturalist Samuel Washington Woodhouse. B. woodhousii tends to hybridize with Bufo americanus in their overlapping ranges.

In Wyoming, this toad is found in floodplains containing permanent water or irrigation runoff in the plains and foothills east of the Continental Divide below .

Great Plains toad The Great Plains toad (Bufo cognatus) is a relatively large species of toad. It ranges from southern Alberta, throughout the western United States, and into northern Mexico. The toad is grey, brown, and green in color, with darker colored blotching. It can grow to anywhere between in length. Its primary diet is various species of cutworms. It prefers grassland habitat with loose soil that is easy to burrow in. Breeding occurs throughout the spring and summer months, most often immediately after heavy rainfall. In dry areas it may only emerge from its burrow for a few weeks when conditions are right, and only at night, but in areas with permanent water bodies and abundant rain it may be active all day.Grismer, L. L. (2002). Amphibians and Reptiles of Baja California. Los Angeles: University of California Press, 69. It has a very loud, harsh mating call.

In Wyoming, this toad is found in plains grasslands, sandhills, agricultural areas, below .

Wyoming toad The Wyoming toad or Baxter's toad (Bufo baxteri or Anaxyrus baxteri) is an extremely rare amphibian that exists only in captivity and within Mortenson Lake National Wildlife Refuge in the U.S. state of Wyoming. The Wyoming toad was listed as an endangered species in 1984, and listed as extinct in the wild since 1991. Before the sharp declines occurred, this toad was classified as a subspecies of the Canadian toad. Database entry includes a range map and a brief justification of why this species is listed as extinct in the wild.

American bullfrog The American bullfrog (Rana catesbeiana),Hillis, D. M. 2007. Constraints in naming parts of the Tree of Life. Molecular Phylogenetics and Evolution 42:331–338.Hillis, D. M., and T. P. Wilcox. 2005. Phylogeny of the New World True frogs (Rana. Molecular Phylogenetics and Evolution 34:299–314. often simply known as the bullfrog in Canada and the United States, is an aquatic frog, a member of the family Ranidae, or "true frogs", native to much of North America.Hillis & Wilcox (2005), Pauly et al. (2009) This is a frog of larger, permanent water bodies, swamps, ponds, and lakes, where it is usually found along the water's edge.Conant, 1958 On rainy nights, bullfrogs, along with many other amphibians, travel overland, and may be seen in numbers on country roads.

In Wyoming, this frog is found near permanent water below on the eastern plains.

Columbia spotted frog

The Columbia spotted frog (Rana luteiventris) is a North American species of frog. It is a medium-sized frog reaching lengths of up to . Its color ranges from a dark, olive green to light brown with irregularly-shaped black spots on its back and legs (rendering its name). The belly and upper lip are white in color. Individuals can be distinguished from other Rana species by their shorter back legs, narrow snout and upturned eyes. Since they spend most of their time in the water, they also have more webbing in their hind feet than similar species.

In Wyoming this frog is found in ponds, sloughs, and small streams in the foothills and montane zones.

Northern leopard frog The northern leopard frog (Rana pipiens)Pauly et al. (2009)) is a species of leopard frog from the true frog family native to parts of Canada and United States. The northern leopard frog is a fairly large species of frog reaching about in length. It varies from green to brown in dorsal colour with large dark circular spots on its back, sides and legs. Northern leopard frogs have a wide range of habitats. They are found in permanent ponds, swamps, marshes and slow moving streams throughout forest, open and urban areas. They normally inhabit water bodies with abundant aquatic vegetation. They are well adapted to cold and can be found above asl. This species was once quite common through parts of western Canada until declines started occurring during the 1970s. The population decline is thought to have been caused by pollution drift from the United States falling in the form of acid rain. Many populations of northern leopard frogs have not yet recovered from these declines.

In Wyoming, this frog is found in swampy cattail marshes and beaver ponds in the plains, foothills, and montane zones up to .

Wood frog The Wood frog (Rana sylvatica) has a broad distribution over North America, extending from the southern Appalachians to the boreal forest with several notable disjunct populations including lowland eastern North Carolina.

In Wyoming, this frog is found in beaver ponds, small lakes, slow moving streams, wet meadows, willow thickets, in the montane zone usually at or near .

Reptiles

Prairie racerunner The six-lined racerunner (Cnemidophorus sexlineatus) is a species of lizard found in the United States, from Wyoming across the Great Plains east to Rhode Island, south to Florida and west to southern Texas, and in northern Mexico, in Tamaulipas.

In Wyoming, the sub-species C. s. viridis is found in plains grasslands, sandhills, sandy or gravelly streambanks, and stream floodplains.

Common sagebrush lizard The sagebrush lizard (Sceloporus graciosus graciosus) is a common lizard found in mid to high latitudes in the Western United States of America. It belongs to the genus Sceloporus (spiny lizards) in the reptile family Phrynosomatidae. Named after the sagebrush plants near which it is commonly found, the sagebrush lizard has keeled and spiny scales running along its dorsal surface.

In Wyoming, the lizard is found in rock outcrops in sagebrush, juniper, semi-arid shrublands, and mountain foothills shrublands, usually below . It occurs in association with geothermal features in Yellowstone National Park at .

Mountain short-horned lizard The mountain short-horned lizard, also called Hernandez's short-horned lizard or the greater short-horned lizard, (Phrynosoma hernandesi) is a diurnal species of phrynosomatid lizard. It is an insectivore, feeding mostly on ants, though will also eat young snakes. The lizards are found throughout the mountain ranges in the western U.S. (as south as Texas) and into Canada. It is found from sea level to over 10,000 feet in elevation. It was formerly classified as Phrynosoma douglassi hernandesi. It was named for Francisco Hernández Médico, a Spanish explorer who in 1651 wrote one of the first accounts of horned lizards.

In Wyoming, this lizard is found in grasslands, sagebrush-grasslands.

Eastern fence lizard The eastern fence lizard (Sceloporus undulatus) is a medium-sized species of lizard found along forest edges, rock piles, and rotting logs or stumps in the eastern United States. It is sometimes referred to as the prairie lizard, fence swift, or gray lizard.

In Wyoming, the sub-species S. u. elongatus, the northern plateau lizard is found in rock outcrops and canyon walls in sagebrush communities. The sub-species S. u. erythrocheilus, the Red-lipped Plateau lizard is restricted to rock cliffs and large areas of boulders along the hogback on the east edge of the Laramie Range in Laramie, Platte, and Converse counties. The sub-species S. u. garmani, the Northern Prairie lizard is found in sandy areas with low shrubs in grassland communities, or sandstone and limestone outcrops in scarp woodland communities.

Many-lined skink The many-lined skink (Eumeces multivirgatus) is a medium-sized member of the Eumeces skinks, a kind of lizard, living in North America. The range of E. multivirgatus is limited in the north by southern South Dakota, Nebraska, and Wyoming and extends in the south until the Arkansas River in Colorado. E. multivirgatus prefers sandy soil and occurs in habitat below .

In Wyoming, this lizard is found in grassland communities on the prairies and in scarp woodlands. It usually occurs under surface objects such as flat rocks or boards.

Cliff tree lizard