Complex sex allocation in the laughing kookaburra
In groups of the cooperatively breeding laughing kookaburra (Dacelo novaeguineae), offspring sex varied with the type of social group and with hatch rank. Groups with female helpers, especially if all helpers were female, had male-biased clutch and fledging sex ratios. Groups without female helpers (unassisted pairs or male-only helpers) had female-biased clutch and fledging sex ratios. Breeding females responded facultatively to increases in the number of female helpers in their group by...[Show more]
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