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Aging, plumage and moult terminology

http://www.prbo.org/cms/docs/terre/Howell%20Birding%20molt%202003%20part%202.pdf
http://www.scricciolo.com/Plumages%20and%20Molts/plumages_molts.htm
http://elibrary.unm.edu/sora/wb/v31n01/p0050-p0056.pdf
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glaucous_gull
glaucous_gull 		glaucous__winged_gull
glaucous__winged_gull 		thayers_gull
thayers_gull 		herring_gull
herring_gull
western_gull
western_gull 		california_gull
california_gull 		ringbilled_gull
ringbilled_gull 		mew_gull
mew_gull
heermanns_gull
heermanns_gull 		hybrid_gulls
hybrid_gulls

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