BS2010-17

Occupation of Monk Parakeet (Myiopsitta monachus) nest cavities by House Sparrows (Passer domesticus) in Rio Grande do Sul, Brazil

Abstract

Occupations of nest cavities in a Monk Parakeet community nest by several House Sparrows are reported. Only male sparrows were included in the aggressive behavior and attacked the larger parrots together. To the best of my knowledge, the observed occupation behavior in the House Sparrow has not been reported previously. Furthermore, this is the first observation of an aggressive occupation of nest cavities in a Monk Parakeet community nest by House Sparrows. The two species are common and well studied, but there is no information about their direct competition by nesting places.

Resumen

Se reporta la ocupación de cavidades de un nido comunal de la Cotorra Monje por varios Gorrioncillos. Solo Gorrioncillos masculinos mostraron un comportamiento agresivo y atacaron (en grupo) a Cotorras Monje. Hasta el momento tal ocupación no se ha reportado antes en la literatura. Además, esta es la primera observación de una ocupación agresiva de cavidades de un nido comunal de la Cotorra Monje por Gorrioncillos. Las dos especies son comúnes y bién estudiadas pero no hay información sobre su competición directa por sitios para anidar.