Longevity Records: Life Spans of Mammals, Birds, Amphibians, Reptiles, and Fish
References
Empidonax difficilis (Western flycatcher)
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Clapp, R.B., N.K. Klimkiewicz, and A.G. Futcher, 1983. Longevity records of North American birds: Columbidae through Paridae. Journal of Field Ornithology 54: 123-137.