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- Title
Differential response by bronzed cowbirds to songs of potential hosts in the lower Rio Grande Valley of Texas.
- Authors
Janecka, Mary J.; Brush, Timothy
- Abstract
How bronzed cowbirds ( Molothrus aeneus) find nests to parasitize is poorly known, especially whether they use host vocalizations as sources of information about nest location and status. We conducted 120 point-count surveys, followed by broadcasts of host songs, at Santa Ana National Wildlife Refuge in the Lower Rio Grande Valley of Texas in 2008 and 2009. Bronzed cowbirds responded to songs of potential host species by flying toward the source of the playback as single females or males or multiple females and males. Bronzed cowbirds responded in greater numbers to the songs of oriole species ( Icterus) than to olive sparrow ( Arremonops rufivirgatus), a lower-quality host species. Such responses by bronzed cowbirds could facilitate the location of host nests for nests of species difficult to find or to look into.
- Subjects
RIO Grande Valley (Colo.-Mexico &; Tex.); BRONZED cowbird; BIRDSONGS; ARREMONOPS; BIRD nests
- Publication
Southwestern Naturalist, 2014, Vol 59, Issue 4, p554
- ISSN
0038-4909
- Publication type
Article
- DOI
10.1894/EKL-03.1