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Yellowstone National Park Visitors enjoy a stroll along a boardwalk near a thermal feature.
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Yellowstone National Park
Bullsnake
A bullsnake slides through the grass
Scientific name: Pituophis catenifer sayi

Identification
  • A subspecies of the gopher snake, it is Yellowstone's largest reptile; ranges from 50 to 72 inches long.
  • Yellowish with a series of black, brown, or reddish-brown blotches down the back; the darkest, most contrasting colors are near the head and tail; blotches are shaped as rings around the tail.
  • Head resembles a turtle's in shape, with a protruding scale at the tip of the snout and a dark band extending from the top of the head through the eye to the lower jaw.
Habitat
  • In Yellowstone, found at lower elevations, drier, warmer climates, and open areas such as near Mammoth.
Behavior
  • Lives in burrows and eats small rodents; behavior that gave the gopher snake its name.
  • Often mistaken for a rattlesnake because of its appearance and its defensive behavior; when disturbed it will coil up, hiss loudly, and vibrate its tail against the ground, producing a rattling sound.

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Lake Trout Illustration

Did You Know?
Lake trout are an invasive species of fish that is decimating the native cutthroat trout population in Yellowstone Lake.
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Last Updated: June 11, 2009 at 10:36 MST