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Speckled Rattlesnakes - Crotalus mitchelli

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Generally, this species does not exceed 100 cm in length, with large males measuring between 90 and 100 cm. The race on Angel de la Guarda Island is known to become larger, the maximum recorded length for a specimen there being 136.7 cm. In contrast, the population on El Muerto Island only reaches a maximum of 63.7 cm in length

Range & Habitat

Found in the southwestern United States and in northwestern Mexico. In the United States, its range includes east-central and southern California, southwestern Nevada, extreme southwestern Utah and western Arizona. In Mexico it is native in most of Baja California, including Baja California Sur. It also inhabits a number of islands in the Gulf of California, including Angel de la Guarda, Carmen, Cerralvo, El Muerto, Espíritu Santo, Monserrate, Piojo, Salsipuedes, San José, as well as on Santa Margarita Island off the Pacific coast of Baja California Sur

Behavior

Like many other snakes, this species tends to be diurnal in cool weather, and nocturnal during hot weather. Speckled rattlers are alert and often quick to rattle when disturbed. Prey consists of small mammals, lizards, and occasionally birds. Mating occurs in spring, and 3 to 11 live young are born in late summer.

Additional Notes : Conservation Status

This species is classified as Least Concern (LC) on the IUCN Red List of Threatened Species (v3.1, 2001). Species are listed as such due to their wide distribution, presumed large population, or because it is unlikely to be declining fast enough to qualify for listing in a more threatened category. The population trend is stable. Year assessed: 2007

Subspecies

Subspecies Common name Geographic range

C. m. angelensis

Angel de la Guarda Island speckled rattlesnake

Mexico, on the island of Ángel de la Guarda.

C. m. mitchellii

San Lucan speckled rattlesnake

Mexico, in Baja California Sur and on the islands of Santa Margarita, Cerralvo, Espíritu Santo, San José, Monserrate and Carmen.

C. m. muertensis

El Muerto Island speckled rattlesnake

Mexico, on the island of El Muerto.

C. m. pyrrhus

Southwestern speckled rattlesnake

The United States in southern California, southern Nevada, southwestern Utah and western Arizona. Mexico in northwestern Sonora and northern Baja California.

C. m. stephensi

Panamint rattlesnake

The United States in east-central California and southwestern Nevada.