Yemen chameleon

Also known as the veiled chameleon, this 2-foot-long reptile has a base color of green, streaked with blue, brown, and yellow stripes. However, true to its chameleon nature, it can change color according to its mood. Its nervous system sends a message to the pigment-containing chromatophore cells in its skin, telling them to expand or contract; in response, they turn brown, blue, red, or yellow