They also communicate by their colouration changes. For example, a female chameleon can easily indicate to a male whether she is receptive to mating or not. When she is pregnant, she displays her gravid colouration, again to tell the males to leave her alone. Chameleons can also display angry colouration, ill colouration, excited and stress colouration etc. All of these give out clear signs to the other chameleons in the area.