Natural history notes and breeding of the Pale Baywing (Agelaioides fringillarius) in northern Minas Gerais, Brazil.

作者：Fraga Rosendo M^*; Neto Santos D'Angelo

来源：Ararajuba, 2014, 22(2): 238-241.

DOI：10.1007/bf03544251

• Pale Baywing
• Agelaiodes fringillarius
• natural history
• nesting
• cooperative breeding
• brood parasitism
• Molothrus rufoaxillaris
• M. bonariensis

In Brazil the Pale Baywing is regarded as an endemic species of the Caatinga biome (Pacheco 2000). We present data on habitat, foraging and breeding of the Pale Baywing (Agelaioides fringillarius) obtained between 2001 and 2005 at Francisco S, Minas Gerais. We document the occurrence of cooperative breeding, and its host-parasite interactions with Shiny (M. bonariensis) and Screaming Cowbirds (Molothrus rufoaxillaris), the last a recent invader in this area. Nests (N = 18) were detected from December to February, during the rainy season. Most nests (N = 12) were placed within domed twig nests built by three furnariid species, and 5 nests were built within the crowns of palm trees. Six nests containing nestlings had from 4 to 6 attending Pale Baywings that brought food and mobbed or attacked avian predators or nest pirates. Two nests contained feathered Shiny Cowbird (M. bonariensis) chicks. Screaming Cowbirds were first seen in Francisco S in 1993, but up to 2005 all Screaming Cowbirds chicks were observed in nests of Chopi Blackbirds (Gnorimopsar chopi), or were flocking and roosting with this host.

• 出版日期2014-6