South American Rattlesnake — Care Sheet & Morphs

Husbandry requirements

South American Rattlesnake — origin: South America: savannas, cerrado, caatinga and semi-arid open areas, from Colombia and Venezuela down to Brazil, Bolivia, Paraguay, Argentina and Uruguay. Generally warm and dry habitat..

Terrarium temperature gradient

Night min20 °C

Cool side24–26 °C

Warm side28–32 °C

Basking spot32–35 °C

A species of open, warm habitats that thermoregulates actively: provide a genuine basking spot at 32-35 °C under one side of the enclosure. A clear thermal gradient is essential. A natural nighttime drop to ~20 °C is tolerated. For breeding, a cool brumation (15-20 °C) of 2-3 months is generally practised.

Enclosure (adult)

120 × 60 × 60 cm

Secured terrestrial terrarium with a lockable opening (imperative for a venomous snake)

VENOMOUS SAFETY: fully escape-proof enclosure, key lock, no gaps. Provide a restraint refuge box (shift box) allowing the animal to be isolated for any maintenance without contact. Two solid hides (warm side and cool side) and a few sturdy low branches. Keeping is subject to legal authorisation (see Sources).

Humidity

40–60 %

Rather dry but not desert conditions. Provide a humid hide during sheds and light occasional misting; avoid a soaked substrate that promotes infections.

Substrate

Newspaper / paper towel (hygiene and safety, to be favoured)Aspen shavingsCypress mulchCoconut fibre

A dry substrate that is easy to inspect and to remove entirely facilitates the remote maintenance of a venomous animal. Avoid fine, dusty substrates that may be ingested or irritate the respiratory tract.

UVB

Recommended

Beneficial without being strictly mandatory if the diet is balanced. Low to moderate UVB (Ferguson zone 2-3, low-power T5 tube) reproduces its natural sun exposure and supports metabolism. Always provide shaded hides.

Water source

Always available

Clean water available at all times in a large, stable, heavy container; renew regularly. The bowl is handled with the animal isolated in the shift box.

Origin

Viperidae

South America: savannas, cerrado, caatinga and semi-arid open areas, from Colombia and Venezuela down to Brazil, Bolivia, Paraguay, Argentina and Uruguay. Generally warm and dry habitat.

Feeding & health

Diet

Carnivore (rodents) — Mice and rats of appropriate size, offered PRE-KILLED (thawed) with long tongs

The venom is specialised to kill mammals quickly. Adults fed every 10-14 days, juveniles roughly weekly. Never offer live prey and always feed with a tube/tongs for safety.

Breeding

Viviparous

Breeding generally triggered by a cool brumation of 2-3 months followed by warming. The female gives birth to neonates that are already fully venomous and independent: take extra care when handling the young.

Health watch points

Respiratory infections (draughts, conditions too humid or too cold)
Stomatitis (mouth rot)
Dysecdysis (incomplete shedding, particularly of the tail tip and the rattle)
Mites and internal parasites
Thermal burns due to poorly shielded heating equipment

Morphs & genetics

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

Albino (T-) amelanisticRec
Leucistic (Unicolor Super Form?) white cascabellRec
Axanthic (Anery)Rec

Named combos — 1 documented combined morphs

Snow

Pairing calculator

Pick each parent's genotype — clutch probabilities update live. Free, no sign-up.

🧬

South American Rattlesnake × South American 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 south american rattlesnake.

Why is the South American rattlesnake considered particularly dangerous?▾

Unlike most North American rattlesnakes, its venom is mainly neurotoxic (crotoxin) and myotoxic, with a very different mode of action requiring a specific antivenom. This species is reserved for expert keepers holding the proper legal permits, and any handling must be carried out exclusively with a hook and restraint tube, never bare-handed.

How does it behave when threatened?▾

It's a defensive, nervous snake that quickly adopts the "S" defensive posture, held higher off the ground than in the diamondback rattlesnake, while buzzing a particularly loud rattle. It does not tame down and remains unpredictable no matter how used to its keeper it becomes.

How big can this species grow?▾

It's a large rattlesnake: adults typically measure between 100 and 160 cm, with a documented record exceeding 180 cm. Males are markedly larger than females.

What terrarium and safety precautions are needed?▾

Plan for a terrestrial terrarium of at least 120 x 60 x 60 cm, fully escape-proof with a locking opening and not the slightest gap. A restraint shift box is essential for isolating the animal during any contact-free maintenance, along with two solid hides on either side of the thermal gradient.

What thermal gradient should be recreated for this open-habitat species?▾

Native to savannas and warm semi-arid areas, it needs a genuine basking spot between 32 and 35°C, a general warm side of 28 to 32°C and a cool side of 24 to 26°C, with a nighttime drop tolerated down to around 20°C.

Does breeding require a winter rest period?▾

Yes, it is generally achieved after a cool brumation of 2 to 3 months between 15 and 20°C, followed by a gradual warm-up. The female then gives birth to 10 to 30 young that are already venomous and independent, requiring extreme caution from the moment they are born.

What substrate is best for this venomous species?▾

Newspaper or paper towel remain the safest choice, as they allow easy inspection and complete removal from a distance. Aspen shavings, cypress mulch or coconut fiber also work well, provided fine, dusty substrates that irritate the respiratory tract are avoided.

How often should a South American rattlesnake be fed?▾

Its venom is specialized for killing mammals quickly, so it feeds on appropriately sized mice and rats, always offered pre-killed and presented on long feeding tongs. Adults are fed every 10 to 14 days, juveniles roughly once a week.

What is this species' life expectancy?▾

It's a long-lived rattlesnake: captive individuals typically live 15 to 25 years, with the upper end of that range favored by rigorous husbandry that avoids excess weight.

Is UVB lighting needed in the terrarium?▾

It isn't strictly essential if the diet remains balanced, but low to moderate UVB (Ferguson zone 2-3, a low-power T5 tube) recreates its natural sun exposure and supports its metabolism. Always provide shaded hides so it can opt out.

What are the most common health problems in this species?▾

The main issues are respiratory infections linked to drafts or overly humid conditions, stomatitis, incomplete sheds affecting the tail tip and rattle, as well as mites and internal parasites. Poorly shielded heating equipment can also cause thermal burns.

Track your south american rattlesnake on ReptiNode

Create a free tracking log: weight, meals, sheds, health record, QR codes and breeding projects — with the built-in genetics calculator for over 200 species.

Create a free account