Reptiles
Veiled Chameleon
Chamaeleo calyptratus · also called Yemen chameleon, cone-head chameleon
The veiled chameleon is the chameleon most people meet — as a pet, in a classroom, or in a nature documentary. It comes from the mountains of Yemen and southwestern Saudi Arabia, and its towering head crest is a clue to how it survives in such dry country.
Overview
Veiled chameleons live across a range of habitats in southwestern Arabia, from lush wadis and plateaus to arid coastal plains, at elevations up to around 2,800 m. They are arboreal and diurnal, spending the day among shrubs and small trees, and they are more tolerant of variable temperature and humidity than most chameleons — an adaptability that made them a mainstay of the pet trade and has let feral populations establish in Florida and Hawaii.
The casque
The most striking feature of the veiled chameleon is its casque, a tall, thin, bony helmet rising from the back of the head — much larger in males. It appears to serve as a water collector: dew and fog condense on it at night and are channelled down to the mouth, an important source of moisture in a climate with little standing water. It also enhances the animal’s leaf-like silhouette and functions in male display.
Chameleon equipment
Like other chameleons, the veiled chameleon is a specialised ambush insectivore:
- Turret eyes that scan independently in almost every direction, then aim forward together to range a target.
- A ballistic tongue launched from a spring-loaded apparatus, reaching well beyond the snake’s own body length in a fraction of a second.
- Pincer feet (fused toes in two opposing bundles) and a prehensile tail for a secure grip on twigs.
- Colour change driven by nanocrystal layers in the skin, used for signalling and temperature control rather than disguise.
Unusually for a chameleon, adults also eat leaves and flowers, partly for the water they contain.
Reproduction
Veiled chameleons are prolific egg-layers. A female digs a burrow and lays a large clutch — often 30 to 80 eggs, sometimes more — and can do so even without mating, producing infertile clutches. The eggs incubate for several months. This heavy investment in egg production is why captive females frequently live shorter lives than males.
Status
The veiled chameleon is Least Concern and common. In its native range it is not considered threatened, though habitat change and collection have local effects. Its bigger footprint is as an introduced species — feral populations in Florida and Hawaii prey on native insects and small animals — and as one of the most farmed reptiles for the global pet trade.
Veiled Chameleon: common questions
What is the casque on a veiled chameleon's head for?
The tall helmet is thought to help the chameleon survive in a dry climate. Overnight, dew and mist condense on the casque and run down its channels to the corners of the mouth, where the chameleon drinks it — a way of harvesting water in mountains where free water is scarce. The casque also makes the flattened body look larger and more leaf-like from the side, and males have a much taller casque than females, so it plays a role in display and mate choice too.
Do chameleons change colour to match their background?
Mostly no — that is a myth. A veiled chameleon changes colour to communicate and to control its temperature. A calm animal is green with pale bands; an excited, aggressive, or courting male flushes bright yellow, blue, and orange; a stressed or submissive one goes dark brown or black; and a female signals whether she is receptive or already carrying eggs with distinct colours. Darkening also lets a cold chameleon absorb more heat. Its resting green does provide camouflage, but the dramatic shifts are signals, not disguise.
How does a chameleon shoot its tongue?
The tongue is stored folded over a spike of cartilage in the throat, wrapped in a sheath of elastic tissue that the chameleon loads like a spring. Muscles then release it, and the tongue launches out in around 20 milliseconds with an acceleration many times that of gravity, its sticky, suction-cup tip grabbing an insect up to one and a half body lengths away. The whole strike-and-retrieve takes well under a second.
Are veiled chameleons good pets?
They are the most widely kept chameleon and among the toughest, tolerating a wider range of conditions than most species, which is why beginners are often steered toward them. Even so they are demanding — a tall, planted, well-ventilated enclosure, precise UVB and heat, a dripper or misting system for water (they will not drink from a bowl), a varied live-insect diet, and no handling. Females need a laying site and lay eggs even without a male, which is hard on their bodies. Nearly all pet veiled chameleons are captive-bred.