Fellow schreef:Het geslacht van veel schildpadden is niet afhankelijk van chromosomen, maar van de omgevingstemperatuur in de tijd dat ze in het ei zitten. Lagere temperatuur worden mannetjes, hogere temperatuur worden vrouwtjes.
Dat vind ik zelf echt vet
Dit is van veel reptielen. Ook van gekko's bijvoorbeeld.

Leopard Gecko Sex and Incubation Temperature
Did you know that leopard gecko’s sex is determined by incubation temperature? When the eggs are incubated at higher temperatures around 88-90 degrees, you will hatch out mostly males. When the eggs are incubated at lower temperatures around 80-82 degrees, you will get mostly females. And lastly if the eggs are incubated at around 84-86 degrees, you will get a mix of both sexes. While temperature sexing is mostly accurate, Mother Nature likes to play tricks against the odds sometimes. You could hatch out a female at high temperature, just as you could hatch out a male at lower temperature. They are rare, but it happens from time to time.
https://blog.onlinegeckos.com/did-you-k ... mperature/