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    Since the s scientists have known that some species of whiptail lizards need a male even less than a fish needs a bicycle. These all-lady lizard species of the Aspidoscelis genus from Mexico and the U. Southwest manage to produce well-bred offspring without the aid of male fertilization. But how do they—and the other 70 species of vertebrates that propagate this way—do it without the genetic monotony and disease vulnerability that often results from asexual reproduction?
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    How Can You Tell Male vs Female Lizards?

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    Sex differences in lizard escape decisions vary with latitude, but not sexual dimorphism

    Others are influenced by environmental conditions, such as temperature. Certain lineages appear to have flipped from genetic- to thermal-based sex determination over the course of evolutionary time, but no experimental data have shown exactly how these transitions occurred. Now, researchers have caught a real-time glimpse of a sex-determination switch in bearded dragons Pogona vitticeps native to Australia. About one-fifth of wild-caught female lizards carried the male sex chromosomes ZZ , according to a study published in Nature today July 1 , and these animals were able to mate and produce offspring whose sex was determined by the temperature at which the eggs were incubated. The findings suggest that sex reversal—the development of females with male chromosomes—may be a mechanism for the transition from a genotypic to a thermal-based mode of sex determination in a population. There are lots of girls running around out there that are genetically male. But whether this occurred in nature, and whether it could cause a transition from genetic to thermal sex determination in a population, was unknown.
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    Sexual selection in scaled reptiles

    I have lizards in my backyard. How do I tell if they are a male or female? Great question, Macie! Most lizards, like many animals, are sexually dimorphic, meaning not only are the genitals different, so are other characteristics such as size, shape, and appearance. While there are few hard and fast rules in the natural world, here are a some things to look for when trying to determine the sex of a lizard.
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    Is there a way to tell the difference between male vs female lizards? How do they attract their mates? One way, Saundra, is to wait until spring and watch them mate: The male is on top.
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