The breeding ecology of the yellow-rumped flycatcher was studied in its natural cavities from 1993 to 2007 at Zuojia Natural Reserve, Jilin province, China. Yellow-rumped flycatchers built their nests in early May and started to lay in middle May. Mean clutch size was 5.27 (N = 117 ) and mean incubation period was 13.21 days (N = 65). Nestlings remained in the nest 11 - 14 days. Forty-eight of 86 nests (55.8 %) were successful in producing at least one young bird, with successful nests producing 4.13 young/nest. Based on exposure, probability of a nest surviving form egg laying to fledging was 0.51. The causes for nest failure were mainly nest usurpation by other secondary cavity-nesters (50 %) and nest predation by snakes (10.3 %).
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