• Infrequently encountered in Yellowstone, perhaps due to its nocturnal and burrowing habits.
• One of two species of snakes in the United States related to tropical boa constrictors and pythons.
• Maximum length of 24 inches.
• Back is gray or greenish-brown, belly is lemon yellow; scales are small and smooth, making it almost velvety to the touch.
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Habitat & Behavior
• Eats rodents.
• May spend great deal of time partially buried under leaves and soil, and in rodent burrows.
• Usually found in rocky areas near streams or rivers, with shrubs or trees nearby.
• Recent sightings have occurred in the Bechler region and Gibbon Meadows.