Thayer's Gull 1cy August (juvenile)
On this page, you'll find some Thayer's Gull in complete juvenile plumage, together with some similar looking species. Classified from large-dark down to pale-small.
American Herring Gull - juvenile
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American Herring Gull (smithsonianus) juvenile, August 25 2010, St. John's, Newfoundland, Canada. Picture: Dave Brown. Still juvenile plumage - all scapulars still juvenile. Note head dimension, with strong bill and fierce look.
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American Herring Gull (smithsonianus) juvenile, October 08 2006, St. John's, Newfoundland, Canada. Picture: Bruce Mactavish. Still juvenile plumage - all scapulars still juvenile.
Thayer's Gull - juvenile
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Thayer's Gull juvenile, October 21 2012, Wisconsin Point, Douglas County, Wisconsin. Picture: Peder Svingen. Still juvenile plumage - all scapulars still juvenile. Smaller head than Herring Gull, and, although the gonys angle is more obvious in this bird, the bill is slender.
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Thayer's Gull juvenile, November 12 2007, Lucchesi Park, Petaluma, CA. Picture: Steve Mlodinow. Still juvenile plumage - all scapulars still juvenile. Rounded head and fine bill suggest female.
Thayer's Gull - 1st basic with some scapulars replaced
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Thayer's Gull first cycle, January 28 2012, Ilwaco, Pacific County, Washington. Picture: Charlie Wright. Some scapulars replaced for 2nd generation feathers (see close-up below).
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Thayer's Gull / Kumlien's Gull intermediate- juvenile
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Kumlien's / Thayer's Gull juvenile, November 12 2007, Lucchesi Park, Petaluma, CA. Picture: Tony Leukering. Jizz nice for Thayer's but overall paleness may indicate influences of Kumlien's Gull genes.
Kumlien's Gull - juvenile
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Kumlien's Gull juvenile / first cycle, January 18 2009. Picture: Tim Lenz. Bird at darker end of the spectrum. Still juvenile plumage - all scapulars still juvenile.
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Kumlien's Gull juvenile, October 30 2008, Dryden, NY, US. Picture: Tom Johnson. This individual seems to be the earliest ever recorded in the Cayuga Lake Basin, first noted at Stewart Park, Ithaca by Paul Hurtado on 23 October.
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