This species of chameleon is found in the mountains of the United Arab Emirates, Saudi Arabia and Yemen (Biotropics) which explains their more sturdy nature, less susceptible to slight temperature and humidity variations unlike their more tropical counterparts. They have a wide range and distribution and a sizeable population (due to a shorter reproductive cycle), but they are currently listed in CITES Appendix II which regulates the importation for this species but most trade comes from specimens bred in captivity.
The Yemen Chameleon is a large species, making it a sought after pet amongst lizard enthusiasts. Male chameleons can grow to as much as 24 inches from head to tail but average growth is up to 18 inches with the females being generally smaller. Their distinguishing feature is a large casque or a helmet-like ridge on their heads. The males are often bright pastel green colour with black and yellow stripes while female colours are not as vibrant. Male chameleons also have spurs on their hind legs not present in females. Yemen chameleons also last longer up to eight years for males (Smithsonian National Zoological Park).
References:
1) Boitropics –
2) CITES Appendix II
3) Smithsonian National Zoological Park
Images:
1) Main image supplied by Andrew Dunbar
2) Sub images supplied by Andrew Dunbar