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Saharan Uromastyx
Uromastyx geyri
The herbivorous 'dinosaur' of the Sahara. A magnificent neon-yellow or fire-red desert lizard armed with a formidable spiked club-tail. Unique among large lizards for its strict vegetarianism and its demand for terrariums that simulate the flames of the desert, with basking temperatures pushing past 125°F (50°C).
Class:Squamata
Order:Squamata
Family:Agamidae
Subfamily:Uromastycinae
Genus:Uromastyx
Species:Uromastyx geyri
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Environment
Terrestrial
Humidity
20 - 30 %
Day temperature
28 - 32 °C
Ambient temperature
32 °C
Night temperature
18 - 22 °C
Basking spot
55 °C
Adult size
19.7 cm
Minimum enclosure
>= 400 L
UVB
High
Species description
Geographical Origin and Habitat: Endemic to the Air Mountains in Niger and the harsh rocky regions of the Sahara Desert in Mali and Algeria. These animals survive in one of the most inhospitable and hottest ecosystems on Earth. They live in complex tunnels dug under boulders, where the air remains cool, to escape the daytime heat which is intolerable even for them.
Taxonomy and Genetics: Agamidae family. The Geyri is the slenderest and most colorful Uromastyx species. In nature and in captivity there are two main chromatic phases (not true artificial morphs): the 'Red' phase (with brick orange or bright red back) and the 'Yellow' phase (neon/lemon yellow). This coloration explodes only if they are exposed to very high temperatures.
Behavior and Habits: Diurnal and extreme heliotherms. They are docile and timid lizards: when threatened, they flee rapidly into their burrows, leaving only their powerful spiny tail exposed at the entrance, using it as a cork and lashing it like a spiked whip against predators. In the terrarium, they quickly learn to associate humans with fresh food, allowing calm handling, though never with the extreme lack of caution of Bearded Dragons.
Morphology: They have a chunky, depressed (flattened) body similar to a rock to absorb heat. The defining trait is the soft abdomen (which inflates like a balloon when annoyed) and the tail bristling with fearsome modified scales shaped like enormous sharp spikes (whorls). They reach 13-14 inches (35 cm). Dimorphism: males are flamboyant (neon red or yellow), females are chromatically dull, tending towards sandy gray or faded light brown.
Care, breeding and tankmates
Terrarium Setup: They require enormous space despite their medium size. Minimum 48x24x24 inches (120x60x60h cm), strictly made of wood (OSB) or materials that retain scorching heat (screen or full glass terrariums dissipate too much heat). They absolutely need a dry substrate to dig in (mix of desert sand, clay, and gravel) and innumerable faux rock hides, or stacks of securely fastened slate slabs (collapses are fatal) to build the basking spot.
Lighting and Heating: THE KEY TO SURVIVAL. The Uromastyx MUST cook under the lamps. The basking spot on the surface stone must register between 120°F and 130°F (50-55°C), a temperature that would kill snakes or geckos. The cool end of the terrarium settles at 82°F (28°C). This massive thermal gradient is achieved only with 100-150W halogen flood lamps. A battery of fluorescent 12-14% UVB tubes over the entire enclosure is ABSOLUTELY MANDATORY. Without this infernal sun, they refuse food, turn black, and die.
Humidity and Hydration: Saharan humidity: it must be kept constantly between 20% and 30%. The terrarium must NEVER be misted and A WATER BOWL MUST NEVER BE PLACED (except for malnourished gravid females). If they inhale stagnant humidity, they succumb in a few weeks to Acute Pneumonia and Respiratory Infections. They derive 100% of their water from the fresh greens they eat.
Feeding and Supplementation: Strict and rigorous herbivores. It is a lethal mistake (often made by novices) to feed them crickets or mice: an excess of animal protein devastates their kidneys causing visceral gout and a painfully agonizing death. The daily diet consists of dark greens (chicory, endive, escarole), softened dry lentils, peas, and millet (bird seed) scattered in the enclosure. Calcium supplementation without D3 must be abundant.
Compatibility: Strictly solitary. Males challenge each other in flashy but bloody biting battles. Females may barely tolerate each other, but the golden rule to avoid severed tails and infections is single-enclosure keeping per animal.
Health and Common Diseases: Lethal hydration: do not bathe or mist the Uromastyx. MBD (rubbery bones, jaw malformation, and muscle tremors) destroys the specimen in the absence of powerful UVB rays. Another common problem is severe dorsal burns if the 130°F lamps are placed too close without a protective wire mesh guard and the animal stands up on its legs and touches them.
Geographic Origin and Distribution
Endemic to the Air Mountains in Niger and the harsh rocky regions of the Sahara Desert in Mali and Algeria. These animals survive in one of the most inhospitable and hottest ecosystems on Earth. They live in complex tunnels dug under boulders, where the air remains cool, to escape the daytime heat which is intolerable even for them.
Origin
Selective breeding and cultivarsNorth AmericaAfrica and Madagascar
Reptile profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 19.7 cm
- Lifestyle/Microhabitat
- No verified data available
- Activity cycle
- No verified data available
- Sociality
- No verified data available
- Reproduction
- No verified data available
- Handling tolerance
- No verified data available
- Brumation
- No verified data available
- Molting
- No verified data available
The catalog's scalar value is 19.7 cm. The ReptTraits v1.2 source reports a maximum adult measurement of 19.7 cm for this species, recorded as snout–vent length (SVL). These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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