Reproduction and Sexual Dimorphism
The frill-necked lizard is sexually dimorphic; meaning the male and female frill-neck differ in their physical appearance. This dimorphism is apparent in the length of the lizard; the male is generally larger than the female. There is little to no dimorphism in the color of the lizard. Frill-necked lizards breed in the early wet season from September to October. Adult males fight for mates, displaying their frills and biting each other. One to two clutches of 6–25 eggs are laid from early to mid-wet season from November to February. The eggs are laid in a nest 5–20 cm below ground, and usually in sunny areas. Incubation takes two to three months. Gender is partly temperature determined, with extreme temperatures producing exclusively females, and intermediate temperatures (29 to 35°C) producing equal numbers of males and females. Their eggs are soft-shelled.
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