Separating female and immature Black-chinned Hummingbirds from Ruby-throated Hummingbirds can be difficult (Tyler, 2005),[2] and depends on a detailed study of individual primaries and rectrices (Pyle 1997),[3] as cited in Butler, et al. (2007).[4]
^Tyler, J. D. 2005. Birds of Southwestern Oklahoma and North Central Texas. Transcript Press, Norman, Oklahoma.
^Pyle, P. 1997. Identification guide to North American birds, Part 1: Columbidae to Ploceidae. Stone Creek Press, Bolinas, California
^Butler, C. J., D. Ledbetter, N. Batchelder, and G. Batchelder. 2007. Black-chinned Hummingbirds breed in Grady County. Bulletin of the Oklahoma Ornithological Society 40: 13-16.
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This article is part of Project Aves, a All Birds project that aims to write comprehensive articles on each bird, including made-up species.
This article is part of Project Apodiformes, a All Birds project that aims to write comprehensive articles on each hummingbird, swift and tree swift, including made-up species.
This article is part of Project Trochilidae, a All Birds project that aims to write comprehensive articles on each hummingbird, including made-up species.
