Males: tend to be bigger than the females, with a large head and a broad yellow/green vertebral stripe, their main colouration being a grey/brown. They display a Blue head during breeding season, when feeding and at the hottest parts of the day. Their colours change very quickly due to their scaling. A full size adult male will be around the 35 cm head to tail, the tail making up more than half of the total length. Female tend to be an olive colour with black marbling, the patterning on their backs being very distinctive.