The Bird with Four Sexes: Challenging the Gender Binary
2025-03-02
White-throated sparrows challenge the traditional binary understanding of sex. This species exists in two color morphs, white-striped and tan-striped, but sex doesn't align neatly with morph. About half of white-striped birds have testes, half have ovaries, and the same is true for tan-striped birds. Remarkably, white-striped birds with ovaries exhibit more aggressive 'male-like' behavior, while tan-striped birds with testes are more docile. This is due to a 'supergene' on chromosome 2 that controls both color and behavior, independent of sex. This research highlights the complexity of biological sex and challenges the simple male/female dichotomy.