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==Male==
==Male==
[[Image:Hemipenes_lizard.jpg|200px|thumb|right|'''Hemipenes - the paired sex organ in male lizards''' (Copyright © RVC and its licensors, Sean Bobbit, Sue Evans, Andrew Devare and Claire Moore. All rights reserved)]]
Male lizards have paired hemipenes that are sac-like and lack erectile tissue. They are stored, inverted, in the base of the tail and may produce bulges in the ventral proximal tail. Only one is used at a time during copulation and it is not involved in urination. The testicles increase in size during the breeding season.
Male lizards have paired hemipenes that are sac-like and lack erectile tissue. They are stored, inverted, in the base of the tail and may produce bulges in the ventral proximal tail. Only one is used at a time during copulation and it is not involved in urination. The testicles increase in size during the breeding season.
A row of femoral pores can be seen on the medial aspect of the thigh in many families of lizard. The waxy secretion of cellular debris produced is thought by some to have territorial scent marking significance and by others to prevent the male sliding on the belly of the female during coitus (see also preanal pore).
A row of femoral pores can be seen on the medial aspect of the thigh in many families of lizard. The waxy secretion of cellular debris produced is thought by some to have territorial scent marking significance and by others to prevent the male sliding on the belly of the female during coitus (see also preanal pore).
Mature adult male iguanas have taller dorsal spines than females, as well as larger dewlaps and operculum scales. Elaborate head ornamentation (horns, crests and plates) can be seen in adult male chameleons but not in females. Generally, for most lizard species, males are larger than their female counterparts or have larger heads, bigger crests, brighter colours, or erectable dewlaps.
Mature adult male iguanas have taller dorsal spines than females, as well as larger dewlaps and operculum scales. Elaborate head ornamentation (horns, crests and plates) can be seen in adult male chameleons but not in females. Generally, for most lizard species, males are larger than their female counterparts or have larger heads, bigger crests, brighter colours, or erectable dewlaps.
==Female==
==Female==