"This Backyard Bird Has a Lot to Teach Us about Sex Variability"

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White-throated Sparrows demonstrate that traits we usually associate with sex can be influenced by genes that are not on sex chromosomes

White-throated Sparrows help us see past the sex binary by forcing us to acknowledge sources of variability other than sex, which is, in reality, only a small contributor to variability for many species. Diversity and plasticity of phenotypic expression is the norm, particularly for traits that correlate with sex. Sex-related traits are simply not hardwired.

https://www.scientificamerican.com/artic...out-sexes/