What if our gender was determined by external temperature at a certain point in fetal development? For these animals, this is the reality!
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'Third Sex' Lizards Could Outcompete Their Normal Female Cousins
"Sex is never simple-even among lizards. Unlike mammals, the sex of central bearded dragons, large lizards found in eastern Australia, is determined by their chromosomes and the environment. If the eggs are incubated in high temperatures, male embryos turn into females."
Fish With Temperature-Dependent Sex Determination: How Common Are They?
"In vertebrates with separate sexes, sex determination can be genotypic or temperature-dependent (TSD). TSD is very common in reptiles, where the ambient temperature during sensitive periods of early development irreversibly determines whether an individual will be male or female. But just how common is this phenomenon in fish?"
Climate Change And Temperature-Dependent Sex Determination In Reptiles
"Despite increasing concern over the possible impact of global temperature change, there is little empirical evidence of direct temperature effects on biotic interactions in natural systems. Clear assessment of the ecological and evolutionary impact of changing climatic temperature requires a natural system in which populations exhibit a direct unambiguous fitness response to thermal fluctuation."
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