Central bearded dragon

Sexual dimorphism is difficult to determine.

An excerpt from the article 19 facts about central bearded dragon

The sexes can be distinguished by a wider cloacal opening in males, a thicker tail base, and a larger head and chin. The coloration of males is also less intense than that of females. They also have a hemipenis, a copulatory organ found in male squamate reptiles (snakes, amphibians and lizards).