Mexican Black Kingsnake — Care Sheet & Morphs

Husbandry requirements

Mexican Black Kingsnake — origin: Northwestern Mexico (Sonora, Sinaloa) and southeastern Arizona (USA). Arid to semi-arid regions: scrubland, rocky plains and the surroundings of water points..

Terrarium temperature gradient

Night min18 °C

Cool side22–26 °C

Warm side29–32 °C

Set up a clear horizontal thermal gradient. Warm zone (heat mat under thermostat or gentle spot) at 29–32 °C at floor level; cool zone 22–26 °C. Nighttime drop tolerated down to ~18 °C (even 15–16 °C occasionally). ALWAYS control heat sources with a thermostat to prevent burns.

Enclosure (adult)

120 × 60 × 45 cm

Horizontal terrestrial terrarium, longer than it is tall, with a firmly locked lid.

Very muscular kingsnake and notorious escaper: every opening must be locked and gaps eliminated. Provide at least two hides (one on the warm side, one on the cool side), branches/bark on the floor and a dry décor. Bigger is always better; 120 cm in length is a minimum for an adult.

Humidity

40–60 %

An arid species tolerating moderate humidity. Avoid a waterlogged substrate (risk of dermatitis). Provide a humid hide (moss/damp paper towel) at shedding time to facilitate a complete shed.

Substrate

Shredded aspenCoconut fibreCypress barkAbsorbent paper / paper towel (quarantine)

Dry to slightly damp substrate, 4–8 cm deep to allow the snake to burrow. Remove droppings immediately. Avoid softwood shavings such as pine/cedar (irritant oils) and substrates kept constantly wet.

UVB

Optional

Not essential for this essentially diurnal/crepuscular species fed whole prey (vitamin D3 intake ensured). Low-level UVB (UVI 1–2, 5–6% tube) remains beneficial if provided, with shaded areas allowing avoidance. Maintain a regular day/night photoperiod (~12 h).

Water source

Always available

Large bowl of clean water at all times, wide enough for the animal to soak in, especially before shedding. Renew the water regularly and clean the bowl to prevent bacterial proliferation.

Origin

Colubridae

Northwestern Mexico (Sonora, Sinaloa) and southeastern Arizona (USA). Arid to semi-arid regions: scrubland, rocky plains and the surroundings of water points.

Feeding & health

Diet

Strict carnivore (rodents in captivity) — Appropriately sized thawed mice and young rats (prey about 1.0–1.5× the width of the snake's body in diameter).

In the wild, an ophiophagous species (it eats other snakes, including rattlesnakes) and has partial resistance to viperid/pit viper venom; in captivity it thrives perfectly on rodents. Schedule: juveniles every 5–7 days, adults every 7–14 days. IMPORTANT: marked cannibalism in captivity — keep each individual SEPARATELY and feed outside the terrarium or with tongs to limit accidental bites. Watch out for obesity from overfeeding.

Breeding

Oviparous

Clutch 6–18 eggs/young. Reproduction triggered by a winter brumation period (~6–10 weeks at 10–15 °C) in adults in good condition. Egg-laying in spring; incubation ~55–65 days at 27–28 °C in humid substrate. It is imperative to separate individuals outside of mating (cannibalism).

Health watch points

Dermatitis / "scale rot" linked to a substrate that is too damp or soiled
Respiratory infections (environment too cold or too humid)
Dysecdysis (incomplete sheds) from insufficient humidity
Mites (Ophionyssus natricis), especially on wild-caught specimens or in collections
Obesity and regurgitations due to overfeeding or a lack of heat for digestion

Morphs & genetics

Registry of 3 documented genes for Mexican Black Kingsnake.

Albino (T-) amelanisticRec
Hypomelanistic hypoRec
Hypermelanistic (Wild Type)Dom

Pairing calculator

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

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Mexican Black Kingsnake × Mexican Black Kingsnake

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 mexican black kingsnake.

Is this Mexican black kingsnake suitable for a beginner?▾

Yes, without hesitation: it is a robust, long-lived and generally very docile species. The only real caveat concerns its feeding response, which can make it prone to biting if it smells food on your hands.

How large does it get as an adult?▾

The robust, muscular body usually measures 90 to 120 cm, with some individuals even exceeding 120 cm up to about 140 cm. Females are often a little bulkier than males.

What terrarium and security should be provided?▾

A horizontal terrarium of at least 120 x 60 x 45 cm suits an adult, with a securely locked lid: this is a notorious escape artist, very muscular, capable of forcing any poorly closed opening.

What thermal gradient should be set up?▾

Set the warm zone between 29 and 32 °C and the cool zone between 22 and 26 °C, always via a thermostat to prevent burns. A night-time drop to 18 °C, or even 15-16 °C occasionally, is perfectly tolerated.

What humidity should be maintained without risking skin problems?▾

Moderate humidity of 40 to 60% suits this species of arid origin. Avoid a waterlogged substrate at all costs, as it promotes dermatitis, and offer a humid hide during sheds.

Why can it bite even though it is reputed to be docile?▾

Its feeding response is very powerful: it can mistake a hand that smells of food, or another recently handled animal, for prey. Outside of feeding, it is one of the easiest kingsnakes to handle.

Can several individuals be kept in the same terrarium?▾

No: it is an ophiophagous species, capable of eating other snakes, including rattlesnakes to whose venom it has partial resistance, and notoriously cannibalistic in captivity. Each animal must be housed separately and fed in isolation, with tongs or outside the terrarium.

What diet and feeding rhythm should be adopted?▾

In captivity, it thrives on thawed mice or young rats with a diameter close to 1 to 1.5 times the body width: every 5-7 days for a juvenile, 7 to 14 days for an adult.

What is its lifespan?▾

It is a robust and long-lived species: 15 to 20 years is the norm, and 20 years or more are common in captivity with good care.

Where does this species come from?▾

It is native to north-western Mexico (Sonora, Sinaloa) and south-eastern Arizona, where it occupies arid to semi-arid regions, scrubland, rocky plains and the edges of water sources.

What health problems should be watched for?▾

Dermatitis from an overly wet substrate, incomplete sheds and mites, especially on wild-origin animals, are the most common concerns. Overfeeding can also lead to obesity and regurgitation.

Is brumation needed for breeding?▾

Yes, a winter brumation of 6 to 10 weeks at 10-15 °C on healthy adults triggers egg-laying in spring. Expect 6 to 18 eggs per clutch, incubated for about 55 to 65 days at 27-28 °C.

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