Female robin sex

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Introductory notes: Although a common species, American Robin can be difficult to age and sex due to a high degree of individual variability. While extremes are readily identifiable, many individuals are not reliably sexed outside of the breeding season, and by spring ageing can also become particularly challenging and should be done only if key features are clearly visible. SY - F Crown brown; underparts orange; rectrices somewhat narrow and tapered; molt limit among greater coverts may be visible.

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With a widespread habitat range and a preference for suburban living, American robins are members of the thrush family and are commonly found in most areas of the United States throughout the year.

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Understanding sex-biased natural selection can be enhanced by access to well-annotated chromosomes including ones inherited in sex-specific fashion. The eastern yellow robin EYR is an endemic Australian songbird inferred to have experienced climate-driven sex-biased selection and is a prominent model for studying mitochondrial-nuclear interactions in the wild. However, the lack of an EYR reference genome containing both sex chromosomes in birds, a female bearing Z and W chromosomes limits efforts to understand the mechanisms of these processes. Scaffolds were tested for W-linked female-only inheritance using a k -mer approach, and for Z-linked inheritance using median read-depth test in male and female reads read-depths must indicate haploid female and diploid male representation.

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