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juvenile Thayer's Gull in flight
	Fig 1) Note the pale inner webs and darker outer webs of the flight feathers; also the extensive pale markings on the outer rectrices. The large pale terminal areas of the rectrices are a common characteristic, but is not shown by all birds. December 10, 2001. Ventura, CA. Photo by Don DesJardin, copyright 2001.

Fig 2) From the underside, note the pale wings but also the thin dark trailing edge to the outer primaries, similar to a tern. Glaucous-winged Gulls do not show this. Oct 10, 2000; Lake Winnipeg, Manitoba. Photo by Ann Cook, copyright 2000.