I think the description of a dark M on the back for a juvenile Sabine's gull makes perfect sense, and is both helpful and descriptive for newer birders. It is a common term when used in relation to Sabine's Gulls in juvenile plumage, and I see no need for a change of the lexicon.
thanks,
Will
On Wednesday, October 28, 2020 at 3:51:04 PM UTC-6 codipper wrote:
All:
The number of species of "small gulls with an M pattern" that are possible in Colorado is five: Ross's, Little, Bonaparte's, and Black-headed gulls and Black-legged Kittiwake. The "M pattern" refers to the "M" described by the dark primaries and the stripe of dark crossing the otherwise pale coverts to the wrist from the base of the wing.
Sabine's Gull does NOT have an "M pattern."
Sincerely,
Tony Leukeringcurrently Fairborn, OH
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