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Clear_Flower_4552 t1_j0xjg4t wrote on December 20, 2022 at 3:41 AM

Reply to comment by Xploited_HnterGather in TIL that The sex of birds is determined by the Z and W sex chromosomes, rather than by the X and Y chromosomes present in mammals. Male birds have two Z chromosomes (ZZ), and female birds have a W chromosome and a Z chromosome (WZ). by treeofliife

Sexual reproduction, specifically males and females, vastly predates human beings. Both sexes are a natural requirement for the species to exist.

You may find it interesting how nest temperature determines reptile sex.

https://embryo.asu.edu/pages/temperature-dependent-sex-determination-reptiles