Underside light gray to dirty white. Series of black bands alternating with green around tail. May be more pronounced in young. Can change color. In captivity, changes from darker to lighter in response to temperature.
Males have better-developed crests.
They have more orange or yellow than females. Large males' femoral pores are 2 to 4 times greater than those of females of equal size. Flap under the neck is stiffened during head-bobbing display. Males secrete a fluorescent substance from glands in their legs. May be used to communicate with others and mark their territories.