Reliable sexing of Iguanas especially when young can be difficult, and in most cases sexing young Iguanas can only be done in certainty by an experienced reptile veterinarian who can tell by an examination called "probing the cloacal vent" However as they get older and nearer maturity...maybe between 1 and 2 yrs of age, then there are some signs that you can look for to help in sexing
In the pictures above one Iguana is male and one is female. A male Iguana usually has a bigger head, sub tympanic shield (the large scales on the cheeks), spines, dewlap and generally a larger head and appearance altogether, it also has what some people term as brain bumps, these are the large fleshy bumps on the top of the head and behind the eyes..these are far more pronounced in a male, and also the jowls..which is the area around the subtympanic shield, are far more pronounced and puffy sort of inflated in a male but flat in a female. So from the pictures above it would be obvious that the male is the the on above.
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