Mojave Rattlesnake — Care Sheet & Morphs

Husbandry requirements

Mojave Rattlesnake — origin: Southwestern North America: southern California, Nevada, Arizona, New Mexico, western Texas and central Mexico. Deserts, semi-deserts and arid grass-and-scrub plains (Mojave, Sonora, Chihuahua)..

Terrarium temperature gradient

Night min18 °C

Cool side24–27 °C

Warm side30–33 °C

Basking spot33–38 °C

Heliophilic desert species requiring a genuine thermal gradient and a hot spot. Preferred body temperature ~29-32 °C. Heat sources (spot/ceramic) must be protected by a guard to prevent burns. A nighttime drop is beneficial (down to 15-18 °C tolerated).

Enclosure (adult)

120 × 60 × 45 cm

Horizontal terrestrial terrarium, fully enclosed, lockable and escape-proof (mandatory for a venomous species). Secured openings, an anti-escape system and an airlock recommended.

Floor space takes priority over height. Provide at least 2 hides (warm side and cool side) and a humid hide. Handling exclusively with hook and tongs, never with bare hands.

Humidity

30–50 %

Dry to moderate ambience. Provide a humid hide (sphagnum) to aid shedding. Avoid any stagnant humidity, which encourages respiratory infections.

Substrate

Desert sand/soil mix (allows burrowing)Aspen shavingsAbsorbent paper (quarantine / health monitoring)

Avoid pure fine sand (risk of ingestion and impaction) and toxic softwood shavings (cedar/pine). Dry substrate, occasionally moistened in the area of the humid hide.

UVB

Optional

Low to moderate UVB recommended (UV index ~5-6%, Ferguson zone 2-3). Not strictly essential but beneficial for this partly diurnal desert species. Always provide a shaded area and a hide allowing it to avoid UV.

Water source

Always available

A small bowl of fresh, clean water available at all times, changed regularly. Desert species: avoid stagnant humidity. All water maintenance is carried out with the animal secured and using the hook.

Origin

Viperidae

Southwestern North America: southern California, Nevada, Arizona, New Mexico, western Texas and central Mexico. Deserts, semi-deserts and arid grass-and-scrub plains (Mojave, Sonora, Chihuahua).

Feeding & health

Diet

Carnivore (rodent-eater) — Rodents (mice, young rats), more rarely lizards, especially in juveniles

Thawed prey of appropriate size. Type A venom (Mojave toxin): a neurotoxin specialised in the rapid paralysis of mammalian prey. Feed once every 7-14 days for an adult, using tongs with the animal secured.

Breeding

Viviparous

Litter of 2 to 13 neonates, generally in summer/late summer. Breeding requires several weeks of winter brumation (cooling). The neonates are venomous and fully dangerous from birth.

Health watch points

Respiratory infections (excess humidity or insufficient thermal gradient)
Dysecdysis / incomplete shedding (humidity too low, no humid hide)
Stomatitis (mouth rot / gingivitis)
External parasites: mites (Ophionyssus natricis)
Thermal burns from unprotected heat sources

Morphs & genetics

Registry of 3 documented genes and 1 named combos for Mojave Rattlesnake.

Albino (T-) amelanisticRec
Hypomelanistic hypoInc.d
Hypermelanistic blackRec

Named combos — 1 documented combined morphs

Hybino

Pairing calculator

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Mojave Rattlesnake × Mojave Rattlesnake

Probabilities per gene (independent loci).

Expected clutchSelect at least one gene on a parent.

Frequently asked questions

Answers to the most common questions about keeping the mojave rattlesnake.

Is the Mojave rattlesnake really dangerous?▾

Yes, this is a venomous snake reserved strictly for experienced, licensed keepers: its bite is an absolute medical emergency. Type A venom contains Mojave toxin, a potent neurotoxin capable of causing respiratory paralysis, a mechanism rare among other North American rattlesnakes. Keeping this species is classed as expert-level and should never be improvised.

Is it as aggressive as its reputation suggests?▾

That reputation is exaggerated: above all, it is a nervous, highly reactive animal that shakes its rattle vigorously as soon as it feels threatened. It bites defensively if approached or handled carelessly, never out of pure unprovoked aggression.

How big does an adult Mojave rattlesnake get?▾

It averages around 100 cm as an adult, with a range of 80 to 120 cm and a record of about 135 cm. It remains smaller and more slender than the western diamondback rattlesnake, with which it is sometimes confused.

What kind of terrarium and safety measures are essential?▾

A horizontal terrestrial terrarium, fully enclosed, lockable and escape-proof, is mandatory for this venomous species, with secured openings and ideally an airlock. Allow at least 120 x 60 x 45 cm with two hides (warm side and cool side) plus a humid hide, and never handle the animal other than with a hook and tongs.

What temperature gradient should be maintained?▾

Provide a warm side of 30 to 33 °C, a cool side of 24 to 27 °C and a basking spot of 33 to 38 °C, with a nighttime drop down to 18 °C. This heliophilic desert species seeks a body temperature around 29-32 °C, and every heat source must be guarded with a grille to prevent burns.

What humidity level and substrate should be chosen?▾

A dry to moderate ambience of 30 to 50% humidity suits it well, along with a humid hide filled with sphagnum moss to aid shedding. A diggable desert sand/soil mix or aspen shavings are suitable, while pure fine sand and softwood shavings should both be avoided, as they are dangerous.

What does it eat and how often?▾

It feeds on thawed rodents of an appropriate size, mainly mice and young rats, offered with tongs while the animal is secured, once every 7 to 14 days for an adult. Its Type A venom is specialised for rapidly paralysing mammalian prey.

Does it need a water point?▾

Yes, a small bowl of fresh, clean water must be available at all times and changed regularly, taking care never to create stagnant humidity. As with all maintenance, access to the bowl is always done with the animal secured, using the hook.

Is UVB necessary for this species?▾

It is not strictly essential, but low to moderate UVB (UV index around 5-6%, Ferguson zone 2-3) is beneficial for this partly diurnal desert species. Always provide a shaded area where the animal can retreat from it.

How does the Mojave rattlesnake reproduce?▾

It is a viviparous species: the female gives birth to 2 to 13 live neonates, generally in summer. Breeding requires several weeks of winter brumation, and the young are born already fully venomous and dangerous.

What health problems should be watched for?▾

The main risks are respiratory infections linked to excess humidity or a poorly set thermal gradient, incomplete sheds when humidity is too low, stomatitis, mites, and burns from unprotected heat sources.

What is its lifespan and activity pattern?▾

It generally lives 15 to 20 years in captivity. Its activity varies with the season: nocturnal to crepuscular in summer to avoid the daytime heat, diurnal in spring and autumn, with winter brumation.

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