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Mexican Giant Tortoise
Gopherus flavomarginatus
The largest land tortoise in North America, endemic to the Bolsón de Mapimí desert basin in Mexico, where it constructs deep burrow networks to survive extreme climates.
Class:Testudines
Order:Testudines
Family:Testudinidae
Genus:Gopherus
Species:Gopherus flavomarginatus
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Environment
Terrestrial
Humidity
30 - 50 %
Day temperature
12 - 34 °C
Ambient temperature
12 - 34 °C
Night temperature
21 - 23 °C
Basking spot
34 °C
Adult size
46 cm
Minimum enclosure
>= 1,000 L
Brumation temperature
5 - 10 °C
UVB
High
Species description
Geographical Origin and Habitat: This critically endangered species is endemic to a small area of the Chihuahuan Desert known as the Bolsón de Mapimí, located in northern Mexico (at the junction of Durango, Chihuahua, and Coahuila). It inhabits clayey desert basins and sandy plains dominated by low desert scrub and native grasses at elevations between 1,000 and 1,400 meters.
Taxonomy and Genetics: Belonging to the family Testudinidae and the genus Gopherus, which comprises the burrowing tortoises of North America. It is the largest species within its genus and the largest land tortoise on the North American continent. Genetic analysis reveals a close relationship to *Gopherus polyphemus*, showing ancient evolutionary divergence.
Behavior and Habits: Strictly crepuscular and highly fossorial. It excavates massive burrow systems that can measure up to 8 meters (26 feet) long and 2.5 meters (8 feet) deep. These burrows are crucial for the tortoise's survival, providing a stable microclimate that protects it from sub-zero winter temperatures and scorching summer heat.
Morphology: Features a broad, somewhat flattened carapace that is dark brown, grey, or yellowish-brown in color, with lighter growth rings. The plastron is pale yellow. The forelimbs are heavily scaled and spade-like, specifically adapted for digging in hard-packed desert soils. Adults can reach a carapace length of 40 centimeters and weigh up to 10-15 kg.
Care, breeding and tankmates
Terrarium Setup: Due to their large size and burrowing habits, indoor keeping is highly impractical for adults. They require massive outdoor enclosures (minimum 30x30 feet for a pair) situated in arid climates. The soil must be compact yet diggable to allow burrow construction. Enclosure walls must extend at least 3 feet underground to prevent escape.
Lighting and Heating: Outdoor housing provides necessary direct sunlight for heat and UVB radiation. If kept indoors during winter (for juveniles), high-output UVB lighting (10.0 or metal halide) is mandatory. Target daytime ambient temperatures of 26-30°C with a basking zone of 35°C. Winter burrow temperatures can drop safely to 8-10°C.
Humidity and Hydration: Adapted to arid conditions with low relative humidity (30-50%). However, their deep underground burrows maintain a higher relative humidity of 60-70%, which is vital to prevent dehydration and respiratory issues. Provide a large, shallow water pan for occasional drinking and soaking.
Feeding and Supplementation: Strictly herbivorous diet, high in fiber and calcium, and low in protein and sugars. Feed native grasses (especially Tobosa grass), spineless Opuntia cactus pads, dandelion, weeds, and grass hay. Dust food items regularly with calcium powder and provide a multivitamin supplement once a month.
Compatibility: Can be kept in small colonies consisting of one male and two or three females, provided the enclosure is large enough. Adult males are territorial and will engage in combat, using their gular horns to overturn rivals. Do not house multiple adult males together in confined spaces.
Health and Common Diseases: Highly susceptible to Upper Respiratory Tract Disease (URTD) caused by Mycoplasma bacteria, which is contagious and can be fatal. Other risks include Metabolic Bone Disease (MBD) due to inadequate UVB/calcium, and external ticks. Regular veterinary health checks and quarantine of new stock are essential.
Geographic Origin and Distribution
This critically endangered species is endemic to a small area of the Chihuahuan Desert known as the Bolsón de Mapimí, located in northern Mexico (at the junction of Durango, Chihuahua, and Coahuila). It inhabits clayey desert basins and sandy plains dominated by low desert scrub and native grasses at elevations between 1,000 and 1,400 meters.
Origin
Central America and CaribbeanNorth America
Reptile profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 46 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 46 cm. The ReptTraits v1.2 source reports a maximum adult measurement of 46 cm for this species, recorded as straight carapace length (SCL). 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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