A Veiled Chameleon (Chamaeleo calyptratus), native to Yemen and southern Saudi Arabia. Shot through glass at the Tropical House, Copenhagen Zoo.
Veiled Chameleons have a casque, a helmet-like ridge, on top of their heads, which is a tiny swelling as a hatchling, but grows to two inches (5 cm) in height as the animal matures. The body length can reach between 10 and 24 inches (25 to 61 cm) from head to the tip of the tail. The males are usually more strikingly coloured than the females, which are usually shades of green mottled with shades of tan, orange, white, and sometimes yellow. Chameleons are probably best known for their long, sticky tongues that they use to catch prey. The tongue can be more than 1.5 times the length of their body. They "shoot" their prey with a tongue that can be projected in the blink of an eye.