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Stage-structured multihormone phenotypes and a shared endocrine milieu underlie facultative male care in a biparental songbird.

Hormones and behavior - 1 Jun 2026

Fernandez-Duque Facundo, Lipshutz Sara E, Plumier Jérôme P, Angelier Frédéric, Huerta Erika Y, Lawson Shelby L, Chikoti Saieshwar, Stiefvater Abby, Soma Kiran K, Hauber Mark E

Abstract excerpt

Parental care varies across reproductive stages, between sexes, and even within individuals. This flexibility raises a key question: does caregiving correspond to distinct circulating hormone profiles, or does it occur within a shared hormonal background that supports rapid, context-dependent shifts in behavior? We investigated these alternatives in red-winged blackbirds (Agelaius phoeniceus), a species in which...

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PMID: 42092312
DOI: 10.1016/j.yhbeh.2026.105937

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