reptile

Collared Lizard

Crotaphytus collaris

The collared lizard is named for the two bold black bands, separated by a lighter band, that wrap around the neck like a double collar — a marking present on both sexes but set off far more dramatically on adult males, which develop a striking wash of blue, green, or turquoise across the body during the breeding season. This is a strictly diurnal, sun-loving ambush-and-pursuit hunter of open rocky terrain, active during the hottest part of the day when most other lizards are seeking shade, and it is built for speed rather than climbing or burrowing: a startled or pursuing collared lizard can rear up and sprint on its hind legs alone, tail lifted for balance, in a genuinely bipedal run that's one of the more distinctive locomotor behaviors in the lizard world. It is also an unusually committed insectivore and opportunistic small-vertebrate predator among commonly kept lizards, taking not just insects but occasionally smaller lizards in the wild, and its basking and UVB requirements run considerably higher than a shade-seeking woodland species like an anole, reflecting the exposed, high-sun rock habitat it comes from.

Husbandry

Enclosure size

At least 36x18x18in for one adult male, with floor space weighted more heavily than height since this species is a ground-and-rock dweller rather than a climber; a fast-moving, high-energy lizard benefits from real horizontal running room beyond the bare minimum

Source: Association of Reptilian and Amphibian Veterinarians (ARAV) husbandry guidance (checked 2026-04-18)

Temperature gradient

A very hot basking surface of 105-115°F (41-46°C) directly under the light, with an ambient gradient down to 80-85°F (27-29°C) at the cool end — among the hottest basking requirements of any commonly kept lizard, reflecting an open, high-sun rocky habitat with little shade

Source: ARAV husbandry guidance (checked 2026-04-18)

UVB lighting

High-output UVB (12% tube or mercury vapor bulb spanning the basking zone) is essential for this strongly heliothermic, sun-basking species; inadequate UVB is one of the more common preventable husbandry failures reported for this species specifically

Source: UVGuide UK lighting guidance (checked 2026-04-18)

Diet

Juveniles typically take a feeding of gut-loaded crickets, roaches, or grasshoppers once a day, with adults settling into a lighter every-other-day rhythm once growth slows; large, well-established adult females are also documented taking an occasional pinky mouse, mirroring the small-vertebrate predation this species shows in the wild

Source: Merck Veterinary Manual — Reptile Nutrition (checked 2026-04-18)

Supplementation

A light calcium (no D3) coating on feeder insects most feedings covers baseline needs, stepped up to a combined calcium/D3-plus-multivitamin product roughly weekly and increased further during active breeding or egg production in females

Source: ARAV husbandry guidance (checked 2026-04-18)

Cohabitation

Adult males are strongly territorial and will fight seriously if housed together, sometimes fatally; a small harem grouping of one male to several females can work if the enclosure is genuinely spacious, but introductions still call for close monitoring given this species' generally high aggression baseline

Source: ARAV husbandry guidance (checked 2026-04-18)

Substrate

A sand-soil blend with embedded flat rocks and basking ledges mimics this species' natural rocky-outcrop habitat and gives it the varied basking heights and hiding crevices it actively uses

Source: ARAV husbandry guidance (checked 2026-04-18)

Handling

Collared lizards are fast, alert, and generally more high-strung than a slower-moving species like a bearded dragon, and a startled individual's first response is usually to run — often on its hind legs alone at speed — rather than to freeze or tolerate an approach. Regular, calm, low-pressure handling from a young age can produce an individual reasonably tolerant of brief, supported handling, but this is not naturally a lap lizard, and forcing frequent handling on a reluctant individual tends to produce a chronically stressed, food-refusing animal rather than a tame one. Adult males in breeding condition are also more reactive and territorial than females or juveniles, and handling around that period should be kept brief and infrequent. This species should never be grabbed by the tail, which can autotomize (detach) as a predator-escape response and will not regrow to its original length or color.

Signs of good health

• Bright, alert eyes and quick, purposeful movement — a collared lizard that's sluggish or reluctant to bask is showing a meaningful change from its normally high-energy baseline
• Strong, even coloration on the collar bands and, in breeding males, the seasonal blue-green body wash developing normally
• A consistent, eager feeding response to offered insects
• A complete, even shed with no retained skin around the toes or tail tip
• No open wound at the tail base — whether the tail is still original or was previously autotomized and is now regrowing
• A body with visible muscle tone along the limbs and no pinched appearance at the tail base

Common problems

14 common reptile problems are tracked for this species; 0 have full guides published so far.

Recommended gear for this taxon

Equipment categories that are genuinely correct for this species' welfare needs — see the full Gear Guide for the complete list.

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