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Description
Mexican Rosy Boa
Lichanura trivirgata
Common Names: Rosy boa, Desert rosy boa
Species Overview
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Size: Adults average 2.5–4 feet (76–120 cm), with females typically larger and bulkier than males.
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Appearance: Rosy Boas often display a triple-striped pattern of dark brown, orange, or reddish bands running along a lighter background. Coloration varies depending on the precise region within the Baja California Peninsula, ranging from bold contrasting stripes to softer, more muted tones. The belly is pale, often unmarked.
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Distribution: The Rosy Boa ranges from southwestern California, Arizona, the Baja Peninsula, and Sonora, Mexico.
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Habitat: Prefers rocky desert slopes, scrublands, and arid canyons where crevices provide shelter and hunting opportunities.
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Behaviour: A primarily nocturnal or crepuscular ambush predator that hunts small mammals, reptiles, and birds. They are slow-moving, secretive, and spend much of the day hidden under rocks or in burrows.
Captive Care
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Enclosure: A 20–30 gallon tank is sufficient for most adults. Provide multiple hides and a rocky, desert-style setup to mimic their natural environment. Secure lids are necessary as Rosy Boas are strong, determined escape artists.
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Temperature & Humidity: Maintain a gradient of 78–82°F (25–28°C) with a basking spot at 88–92°F (31–33°C). Nighttime temperatures can safely drop to 70–72°F (21–22°C). Humidity should be kept low, around 25–40%, with a small humid hide offered during shedding.
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Diet: Juveniles feed on pinky mice every 5–7 days; adults on small mice or fuzzy rats every 10–14 days. They have efficient metabolisms and should not be overfed.
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Behaviour in Captivity: Known for being docile, slow-moving, and easy to handle, Rosy Boas are among the most beginner-friendly boa species. They rarely bite but may ball up or musk when threatened.
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Special Considerations: Care requirements remain consistent across Rosy Boa localities, but natural coloration and pattern vary by region.
Locality Note
The Mexican Rosy Boa is not a true locale, but a region, and as such the specific locale is not delineated.

