Femoral pores can be found near the underside of the base of their tail and particularly on their back legs. They contain several unique glands that emit pheromones and look distinctly different depending on the sex. Checking out an iguana’s femoral pores is one of the best ways to determine their sex at an early age, especially since they don’t have external genitalia.
Males would have a waxy object protruding from the pores which forms a comb-like shape, whereas female femoral pores are plain flat. These characteristics usually start appearing after around 12 months.