Chamaeleo calyptratus Duméril & Duméril, 1851

Adult Size

Adult male veiled chameleons (Chamaeleo calyptratus) measure 43 to 61 cm (17 to 24 in) from snout to tail tip, while adult females are shorter, reaching no more than about 35 cm (14 in), and have thicker bodies.

Head Casque Structure

Both sexes have a casque (a raised bony structure) on the head that grows larger as the chameleon matures, reaching up to about 5 cm (2.0 in) in the largest adults.

Hatchling Base Coloration

Newly hatched veiled chameleons are pastel green, and develop stripes and varied coloration as they mature.

Female Adult Coloration

Adult females are green with white, orange, yellow, or tan mottling.

Male Adult Coloration

Adult males have brighter coloration with more defined bands of yellow or blue, plus some mottling.

Social Coloration Factors

Multiple factors can affect this species' coloration, including social status. In experimental conditions, young veiled chameleons raised in isolation developed darker, duller coloration than those raised with other individuals.

Context-Dependent Color Shifts

Females change color over the course of their reproductive cycles, and veiled chameleons also typically shift to a much darker color when stressed.

Native Range

The veiled chameleon is an arboreal species native to the south-western Arabian Peninsula, where it inhabits a semi-arid tropical climate.

Native Habitat Types

It occupies multiple habitat types in its native range, including plateaus, mountains, and valleys, and lives in trees and other large plants.

Preferred Temperature Range

It prefers warm temperatures, generally between 24 and 35 °C (75 and 95 °F).

Captivity Stress Susceptibility

This species is highly susceptible to stress, which makes it difficult to treat in captivity.

Sexual Maturity Timeline

Veiled chameleons reach sexual maturity at four to five months old, and can breed multiple times per year.

Female Egg Laying

Females lay large clutches of up to 85 tough, white eggs, which they bury in sand.

Embryonic Diapause Basics

Embryos enter a dormant state called diapause that typically lasts 60 to 75 days within the egg before development begins, and rising substrate temperatures initiate this development.

Embryonic Development Observation

A 2004 study found that while veiled chameleon embryonic development usually starts at fertilization and continues until hatching, development sometimes stalls at the gastrula stage for months after eggs are laid.

Diapause Environmental Controls

The study's researchers found that moisture levels have little to no effect on this delay, but temperature plays a determining role in development time: an increase in ambient temperature initiates development of diapausing embryos.

Juvenile Growth Rate

Juvenile veiled chameleons can increase their body mass by up to two orders of magnitude within one year after hatching.

Feeding Structure Allometry

Their feeding structures (mouth, snout, tongue, jaw) grow rapidly while remaining functional, so the musculoskeletal system of these feeding structures grows with negative allometry relative to snout-vent length (SVL).

Jaw Movement Ontogenetic Shift

Studies of captured veiled chameleons show that jaw movement velocity is typically greater in adults than in juveniles, which indicates a shift in energy storage and tongue projection release mechanisms between the juvenile and adult life stages.

Sex Ratio Temperature Independence

Unlike many other reptiles, veiled chameleon sex ratios are not affected by incubation temperature. Even when accounting for differential mortality, any sex ratio bias is negligible.

Temperature-Dependent Sex Ratio Misconception

Anecdotal claims of temperature-dependent sex ratios in this species came from reporting and statistical errors.

Natural Lifespan

Veiled chameleons have a naturally short lifespan: even with good care, they typically only live 6 to 8 years, and males usually live longer than females.