Acanthosaura is a genus of lizards commonly known as mountain horned dragons, or pricklenape agamas. They are so named because of a row of dorsal spines which runs down the back of their necks. They are arboreal lizards found in Southeast Asia. They are medium-sized, ranging from about 7.5 to 15 inches in length, depending on species and individual. They tend to prefer higher elevation areas with dense vegetation.