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GAP Analysis Predicted Distribution Map

Night Snake   Hypsiglena torquata

Species Code: HYTO

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Breeding Range Map
The green area shows the predicted habitats for breeding only.
© NatureMapping Program

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Predicted breeding range

= Core Habitat
= Marginal Habitat


night snake photo

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Breeding Range Map
Reptiles do not migrate as some birds and mammals, so the colored areas depict the predicted range for the Night Snake year-round. The habitats were identified using 1991 satellite imagery, other datasets and experts throughout the state, as part of the Washington Gap Analysis Project.

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Metadata (Data about data or how the map was made)

Distribution and Habitat Requirements
The Night snake has been found in a variety of habitats in Idaho, including rocky areas along the canyon rim of the Snake River, at the base of talus slopes, and in shadscale and greasewood areas away from the Snake River Canyon (Diller and Wallace, 1981).

habitat 110 picture habitat 522 picture

The Columbian Basin, Southeast Cascades, and East Central Cascades ecoregions were selected. The Central Arid Steppe, Wheatgrass/Fescue, Three-tip Sage, Canyon Grasslands, Big Sage/Fescue and Ponderosa Pine vegetation zones were core. The Douglas-fir zone in the East Central Cascades was marginal.

Good habitats were cliffs, talus slopes, grasslands, shrub savannas, shrublands, rivers and riparian wetlands with emergent herbs/shrubs and hardwood trees.

Translated from the Washington Gap Analysis Amphibians and Reptiles Volume by Karen Dvornich

Webpage designed by Dave Lester.