The veiled chameleon, Chamaeleo calyptratus, is a large species of chameleon found in the mountain regions of Yemen, United Arab Emirates and Saudi Arabia. It is also sometimes referred to as the Yemen Chameleon.
The male veiled chameleon is green in color and, depending on the animal’s emotional state, this green will range from a bright lime green to a red olive drab. Surroundings only partly contribute to a chameleon’s “decision” to change color. The green base color is marked with stripes and spots of yellow, brown, and blue. Non-breeding females and juvenile chameleons are generally a uniform green color with some white markings. Breeding and gravid females are a very dark green with blue and yellow spots. The prominence of these markings is dependent on several factors including health, mood, and temperature of the lizard.
(From Wikipedia, April 23, 2010)
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The veiled chameleon is characterized as an aggressive, brightly colored chameleon. They have a casque found on top of their heads, which is a tiny swelling when a hatchling, but grows to two inches in height. They typically have bold bands circling their body primarily of bright gold, green and blue mixed with yellow, orange or black. They also have very long cones on their gular crest. There is sexual dimorphism.