Encyclopaedia
ReptileTerrestrialAdvanced
©AI Generated·Proprietary
Mexican Pygmy Rattlesnake
Crotalus ravus
Endemic to central Mexico's mountains, this small rattlesnake thrives in cool, high-altitude forests. It requires a secure, escape-proof terrarium with low temperatures.
Class:Squamata
Order:Squamata
Family:Viperidae
Subfamily:Crotalinae
Genus:Crotalus
Species:Crotalus ravus
Share
Check out Mexican Pygmy Rattlesnake on Atlarium
Environment
Terrestrial
Humidity
45 - 65 %
Day temperature
14 - 26 °C
Ambient temperature
14 - 26 °C
Night temperature
17 - 19 °C
Basking spot
28 °C
Adult size
70 cm
Minimum enclosure
>= 100 L
UVB
Low
Species description
Geographical Origin and Habitat: This species is endemic to the mountainous regions of central Mexico, occurring primarily in the states of Puebla, Veracruz, Tlaxcala, Morelos, Mexico, and the Federal District. It inhabits montane grasslands and pine-oak forests within the Trans-Mexican Volcanic Belt at high elevations ranging from 2,000 to 3,000 meters above sea level.
Taxonomy and Genetics: Classified as *Crotalus ravus* (historically placed in the genus *Sistrurus* as *Sistrurus ravus*). It belongs to the family Viperidae and subfamily Crotalinae. There are three recognized subspecies (*C. r. ravus*, *C. r. exiguus*, and *C. r. lutosus*) which vary slightly in geographic distribution and color patterns.
Behavior and Habits: Primarily terrestrial, diurnal, and crepuscular. Due to the high altitude of its native habitat, it has a low tolerance for excessive heat and prefers cooler environments. It spends colder hours sheltered in rodent burrows or under flat rocks, emerging to bask during sunny mornings.
Morphology: This is one of the smallest rattlesnake species, with adults reaching a length of only 40 to 65 centimeters. The body is thick-set with an oval or triangular head. The base color ranges from grey to yellowish-brown, marked with a series of large, dark rectangular blotches along the back and smaller spots on the sides. The rattle is small and produces a very soft sound.
Care, breeding and tankmates
Terrarium Setup: Keeping this venomous species is restricted to licensed professionals. Requires a secure, escape-proof terrarium (minimum 32x16x16 inches for an adult) fitted with key locks. The substrate should consist of a dry mix of soil, orchid bark, and leaf litter. Provide stable flat rocks for basking and dry hides at both ends of the enclosure.
Lighting and Heating: As a highland species, it does not tolerate hot temperatures. Keep daytime ambient temperatures at 22-25°C on the cool side, with a localized basking spot not exceeding 28°C. Nighttime temperatures must drop significantly to 15-17°C to mimic highland conditions. A low-output UVB source is recommended.
Humidity and Hydration: Maintain moderate humidity levels between 45% and 60%. Light misting once a week can assist during the shedding cycle. A heavy, non-tippable water bowl filled with fresh, clean water must be accessible at all times to prevent dehydration.
Feeding and Supplementation: Feeds on lizards, small rodents, and amphibians in the wild. In captivity, they feed on appropriately sized thawed mice. Feed adults once every 10-14 days; monitor body condition closely as they are prone to obesity in captivity. Supplementation is generally not required for animals fed whole rodents.
Compatibility: Strictly solitary. House individually to prevent stress, competition, and cannibalism. Introduction of pairs should only be attempted by experienced venomous keepers for controlled breeding attempts, and the animals must be monitored constantly.
Health and Common Diseases: Overheating is the single greatest hazard in captivity: temperatures above 30°C can cause heat stroke and death rapidly. Respiratory infections from stagnant air and scale rot from damp substrate are also common. Always handle using professional snake hooks, tongs, and safety protocols.
Geographic Origin and Distribution
This species is endemic to the mountainous regions of central Mexico, occurring primarily in the states of Puebla, Veracruz, Tlaxcala, Morelos, Mexico, and the Federal District. It inhabits montane grasslands and pine-oak forests within the Trans-Mexican Volcanic Belt at high elevations ranging from 2,000 to 3,000 meters above sea level.
Origin
Central America and Caribbean
Reptile profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 70 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 70 cm. The ReptTraits v1.2 source reports a maximum adult measurement of 70 cm for this species, recorded as total length (TL). 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.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
