Survey of five Australian avians finds numerous discordant individuals, including a genetically male bird that had laid an egg



Summary

A study of five Australian bird species revealed surprisingly high rates of discordance between sex chromosomes and outward sex characteristics. Researchers identified individual birds exhibiting genetic sex that didn’t match their physical appearance or behavior. Most notably, a genetically male bird was found to have laid an egg. This finding suggests a complex interplay between genes and environment in sex determination and differentiation in these avian populations, challenging simplistic views of biological sex as a binary trait. The study highlights the need for further investigation into the mechanisms underlying sex determination in birds.

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