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COOPERATIVE BREEDING IN THE BROWN-HEADED NUTHATCH
The Wilson Journal of Ornithology
We monitored two color-marked populations of the Brown-headed Nuthatch (Sitta pusilla) for Ն5 years and collected data on survival, dispersal, territoriality, and cooperative breeding. Adults (n ϭ 284) were sedentary, maintained long-term pair bonds, and had higher apparent annual survival (66-78%) than previously reported. Territories monitored (n ϭ 347) contained up to five adults; the percentage of territories containing Ͼ2 adults averaged ϳ20% but varied widely. Most groups with Ͼ2 adultsdoi:10.1676/06-006.1 fatcat:fgktyyghozaffmlkshjrpb44om