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We used DNA fingerprinting to document serial polyandry in a double-brooded female Long-eared Owl (Asio otus) in western Montana. We also determined that an extra male that helped provision offspring at a nest was a close relative of the female parent. The nest had split paternity, and it is not clear whether the helper was the sire or brother of two of the four nestlings. These data constitute the first known cases of serial polyandry and alloparenting in Long-eared Owls and leave open the question of whether cooperative polyandry also occurs in this species. Poliandría en Serie y Alopaternidad en Asio otus Resumen. Empleamos huellas dactilares genéticas (i.e., DNA fingerprinting) para documentar poliandría en serie en una hembra de Asio otus que presentó dos nidadas, en el oeste de Montana. También determinamos que un macho extra-pareja que ayudó a abastecer a los pichones en un nido era un pariente cercano de la madre. El nido presentó paternidad compartida y no está claro si el ave que ayudaba era el padre o el hermano de dos de los cuatro polluelos. Estos datos representan el primer caso conocido de poliandría en serie y alopaternidad en Asio otus, y deja abierta la pregunta si en esta especie también ocurre poliandría cooperativa.

Serial Polyandry and Alloparenting in Long-Eared Owls