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Heermann's Gull heermannii adult PB moult, July 05 2017, Pismo Beach, California USA. Picture: Alex Abela.
See Alex's Flickr site for many more images, illustrating the plumage development in this species.
Old feathers heavily worn and bleached to faded pale brown. White tips of tail-feathers largely worn away.
Pre-basic moult started with new scaps and wing-coverts grey, strongly contrasting to old feathers. Central primaries missing / growing, new primaries with neat white tips again; outer primaries still old, also worn and bleached to brown.
P7-P10 old.
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Heermann's Gull heermannii