During the breeding seasons 2001-2005 we determined the nest measurements and characteristics of a Chilean Hawk (Accipiter chilensis) pair in an Andean Nothofagus forest of northern Patagonia (36°S; 50 km east of Chilln). The five platforms were built on forked branches in the upper part of the trees, 16-20 m above ground. One nest and one nesting tree were reused. Nests were built close to the main trunk or a vertical gross branch. The nesting trees were live adult Nothofagus dombeyi trees. The measured nests were oval-shaped platforms similar in size. Nests were built with dry twigs and sticks, which were strongly intertwined. The egg-shell remains found under the nesting trees were light bluish white or dull white, unspotted and nonglossy on the outer surface, and bluish tinged on the inner surface. Minor differences were found between our descriptions and those previously documented, which could be due to differences in sample size, individual differences between pairs, or structure of the nesting tree.

Resumen

Entre las estaciones reproductivas de 2001 a 2005 evaluamos las caractersticas y morfologa del nido de una pareja de peuquitos (Accipiter chilensis) en un bosque andino de Nothofagus en Patagonia norte (36°S). Las cinco plataformas estuvieron ubicadas sobre ramas horquilladas en la parte superior de los rboles, 16-20 m sobre el suelo. Un nido y un rbol/nido fueron reutilizados. Los nidos fueron construidos apegados al tronco principal o a una rama vertical gruesa. Todos los rboles/nido fueron Nothofagus dombeyi adultos vivos. Las plataformas medidas presentaron una forma oval de tamao similar. Los nidos fueron construidos con ramas secas las cuales estaban fuertemente entrelazadas. Los restos de cscaras de huevo de peuquitos encontradas bajo los nidos presentaron un color blanco azuloso o blanco sucio, sin manchas y sin brillo en la superficie externa y un color azuloso en la superficie interna. Algunas divergencias se encontraron entre nuestras descripciones y aquellas documentadas previamente, lo que podra deberse a diferencias en tamaos de muestra, diferencias individuales entre parejas, o a la estructura de los rboles nido.