Geyr's spiny-tailed lizard — Care Sheet & Morphs

Husbandry requirements

Geyr's spiny-tailed lizard — origin: Central and southern Sahara (Niger, Mali, southern Algeria), rocky and arid habitats.

Terrarium temperature gradient

Night min18 °C

Cool side26–32 °C

Warm side35–42 °C

Basking spot48–58 °C

An extreme hot spot is ESSENTIAL for digestion in this heliophilic species: aim for a basking surface at 48-58°C (field reference 45-55°C) under a powerful spot lamp. A clear thermal gradient towards the cool side is mandatory. At night the heating can be switched off (a drop to ~18°C is well tolerated).

Enclosure (adult)

120 × 60 × 45 cm

Terrestrial desert terrarium

A large floor area is the priority: 120 x 60 cm minimum for an adult, larger is always better. Provide a very marked thermal gradient, plenty of hides and stacks of stable rocks (fixed to the floor to prevent any collapse during burrowing). Good ventilation is essential. Favour a captive-bred animal (see substrate note).

Humidity

20–40 %

A strictly desert species: a dry, well-ventilated environment. Chronically high humidity encourages respiratory and skin infections.

Substrate

Sand/clay-soil mix (allows digging and holds the tunnels)Non-calcareous play sand (playsand)Stacked flat rocks and fixed hides

Provide a deep layer (15-20 cm) for natural burrowing. Avoid digestible "calcium" sands (risk of impaction). WARNING: the genus Uromastyx is listed under CITES Appendix II (EU Annex B): it is imperative to favour a captive-bred animal with a certificate. Wild-caught specimens are frequently parasitised, stressed and dehydrated, and their trade is regulated.

UVB

Recommended

Essential. Powerful UVB of the T5 HO 10-12% type (Ferguson zone 3-4), positioned at the correct distance from the basking spot and renewed every 6 to 12 months. A strongly heliophilic desert species.

Water source

Always available

No large permanent water point needed. Offer a small dish of clean water for a few hours 1 to 2 times a week, or lightly mist a hide. Most of the hydration comes from fresh plants.

Origin

Agamidae

Central and southern Sahara (Niger, Mali, southern Algeria), rocky and arid habitats

Feeding & health

Diet

Herbivore — No animal prey needed; to be avoided, especially in adults (risk of gout)

Based on a variety of leafy plants (dandelion, endive, lamb's lettuce, clover, rocket, edible flowers) supplemented with dry seeds and legumes (lentils, millet, split peas). Dust regularly with calcium (without D3 if UVB is of good quality) and supplement with vitamins in moderation. Avoid excess spinach/cabbage (oxalates/goitrogens) and any animal protein.

Breeding

Oviparous

Clutch 8–20 eggs/young. Breeding is generally triggered by a winter cooling/rest period (brumation). Provide a moist, deep laying zone. Incubation of about 55 to 80 days depending on the temperature.

Health watch points

Metabolic bone disease (calcium deficiency or insufficient UVB)
Intestinal obstruction / impaction (unsuitable substrate or dehydration)
Gout (excess animal protein and/or chronic dehydration)
Obesity (excess fatty seeds, overfeeding, lack of space)
Respiratory infections (temperature too low or excessive humidity)

Morphs & genetics

Registry of 1 documented gene for Geyr's spiny-tailed lizard.

HypomelanisticDom

Frequently asked questions

Answers to the most common questions about keeping the geyr's spiny-tailed lizard.

How big does Geyr's spiny-tailed lizard get, and do males look like females?▾

It is one of the smallest species in the genus Uromastyx, with an adult size of 25 to 40 cm in total length, tail included. Sexual dimorphism shows up mainly in coloration: males display a far more vivid red or yellow than females.

What terrarium and setup suit it?▾

Provide at least 120 x 60 x 45 cm for an adult, favouring a large floor area over height. Multiply the hides and stacks of flat rocks, securely anchored to the floor to prevent any collapse when it digs, and don't forget good ventilation.

Why is such an extreme basking spot necessary?▾

This spiny-tailed lizard is a great heat lover: a basking spot of 48 to 58 °C (around 45-55 °C in the wild) is essential for its digestion. The rest of the terrarium follows a marked gradient, between 35-42 °C on the warm side and 26-32 °C on the cool side, with heating that can be switched off at night since a drop to around 18 °C is well tolerated.

What humidity level should be maintained?▾

A dry, well-ventilated environment, between 20 and 40 %, matches its natural Saharan habitat. Chronically high humidity exposes this desert species to respiratory and skin infections.

Which substrate should you choose, and is keeping it regulated?▾

A mix of sand and clay soil, or non-calcareous play sand, with a deep 15 to 20 cm layer, lets it dig stable burrows; complete it with stacked, secured flat rocks. Since the genus Uromastyx is listed in CITES Appendix II (Annex B in the EU), it is far better to insist on a captive-bred animal with a certificate, as wild specimens are often parasitised and stressed.

What does Geyr's spiny-tailed lizard eat?▾

It is a herbivore: not the slightest animal prey is needed, and it is better avoided in adults because of the risk of gout. The basis of the diet consists of varied leafy greens (dandelion, endive, lamb's lettuce, clover, arugula, edible flowers), supplemented with dry seeds and legumes such as lentils or millet, with a regular but measured intake of calcium and vitamins.

Should it be given drinking water?▾

No large permanent water body: a small dish offered for a few hours, once or twice a week, or a light misting of a hide is enough, as most of its hydration comes from fresh greens.

Does it need UVB?▾

Yes, strong UVB is essential for this very heliophilic species: a T5 HO tube at 10-12 % (Ferguson zone 3-4), correctly positioned relative to the basking spot and replaced every 6 to 12 months.

What is its life expectancy?▾

Count on 15 to 25 years, or even more, in captivity with care suited to its heat and dietary needs. It is therefore a long-term commitment despite its modest size.

Is it a species suited to a keeper with little experience, and how does it behave?▾

Rated intermediate in difficulty, it is one of the most manageable Uromastyx once its heat and UVB needs are met. Skittish on arrival, it tames well over time, becomes confident, and is very active during the day, loving to wedge itself into the rocky crevices of the terrarium.

Does breeding require a winter rest period?▾

Yes, breeding is generally triggered by a phase of cooling and winter rest (brumation). The female then lays 8 to 20 eggs in a deep, moist laying area, with incubation of about 55 to 80 days depending on temperature.

What health problems should be watched for in this species?▾

The main risks are metabolic bone disease from insufficient UVB, intestinal impaction linked to an unsuitable substrate, gout from an excess of animal protein, and obesity if the diet is too rich in seeds or the space too small. Too low a temperature or excessive humidity also promote respiratory infections.

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