Variable Kingsnake (Green Phase)

Variable Kingsnake (Green Phase)

Scientific Name: Lampropeltis mexicana thayeri
Common Name: Variable Kingsnake, Thayer’s Kingsnake

---

Species Overview

Size: Adults typically reach 2.5–3.5 feet (0.75–1.1 m) in length, with a slender, agile body and smooth, glossy scales.

Appearance: The Green Phase Variable Kingsnake is a selectively bred colour form developed to enhance the natural olive and sage tones found in certain wild populations. This line features a muted green, olive, or yellow-green background with contrasting brown, grey, or black blotches bordered by cream or light tan outlines. The overall effect is subtle yet striking, blending earthy and metallic hues into a natural, camouflaged look. In some individuals, the green undertones intensify with maturity, producing a mossy or bronze sheen under natural light. This phase reflects the remarkable pigment diversity of the species and highlights how selective breeding can refine naturally occurring colour variations without exaggeration.

Distribution: Originates from selective captive breeding of Variable Kingsnakes, a species native to the highlands of northeastern Mexico, primarily in Coahuila, Nuevo León, and Tamaulipas.

Habitat: Variable Kingsnakes inhabit rocky slopes, semi-arid forests, and grassland valleys in northern Mexico. In captivity, this morph thrives in naturalistic terrariums with soft substrate, climbing branches, and secure hiding areas.

Behaviour: These snakes are calm, curious, and intelligent. They are alert but typically docile once accustomed to regular handling, making them excellent display animals for naturalistic setups.

---

Captive Care

Enclosure: Provide an enclosure at least 3 feet × 18 inches × 18 inches for adults. Include multiple hides, climbing décor, and smooth furnishings. A naturalistic substrate such as soil, coconut fibre, or aspen allows burrowing and helps regulate humidity.

Temperature & Humidity: Maintain a daytime gradient of 78–85°F (25–29°C) with a basking area near 88–90°F (31–32°C). Allow nighttime drops to around 70°F (21°C). Maintain humidity between 45–60%, offering a humid hide during shedding.

Diet: Offer frozen-thawed rodents every 7–10 days for juveniles and every 10–14 days for adults. These snakes are reliable feeders and rarely refuse meals.

Behaviour in Captivity: Variable Kingsnakes are active and inquisitive but gentle when handled regularly. They thrive with consistent care and display their colours best under moderate, full-spectrum lighting.

Special Considerations: Kingsnakes should always be housed individually, as they may consume other snakes.

---

Genetics Note

Green Phase (Polygenic Selective Trait): A selectively bred colour line emphasizing olive, yellow-green, and earthy tones. Expression ranges from subtle greenish overtones to fully saturated olive coloration, with contrasting dark blotches or reduced patterns depending on lineage.

Polygenic Nature: The Green Phase is polygenic, achieved through multi-generational selective breeding rather than a single-gene mutation. Expression can vary significantly, with some individuals appearing bronze or mossy while others display true olive or lime hues across the dorsal surface.

---

Genetic Combination Summary

The Variable Kingsnake (Green Phase) expresses a selectively bred, polygenic colour enhancement:

• Green Phase (Polygenic): Enhances olive and yellow-green tones, producing a natural, earthy appearance with reduced red and orange pigmentation.

This line reflects the understated beauty of the species’ natural colour spectrum, offering a refined, camouflaged appearance uncommon among captive kingsnakes. The Green Phase Variable Kingsnake is valued for its subtle elegance and its resemblance to the wild hues of Mexico’s highland populations.