Gull Research Organisation

Thayer's Gull (thayeri) (last update: January 22, 2013)
Coordinators: Amar Ayyash (USA) Mars Muusse (Netherlands) thayers rings thayers PDF's thayers 1cy August thayers 1cy September thayers 1cy October thayers 1cy November thayers 1cy December thayers 2cy January thayers 2cy February thayers 2cy March thayers 2cy April thayers 2cy May thayers 2cy June thayers 2cy July thayers 2cy August thayers 2cy September thayers 2cy October thayers 2cy November thayers 2cy December thayers 3cy January thayers 3cy February thayers 3cy March thayers 3cy April thayers 3cy May thayers 3cy June thayers 3cy July thayers 3cy August thayers 3cy September thayers 3cy October thayers 3cy November thayers 3cy December thayers sub-ad January thayers sub-ad February thayers sub-ad March thayers sub-ad April thayers sub-ad May thayers sub-ad June thayers sub-ad July thayers sub-ad August thayers sub-ad September thayers sub-ad October thayers sub-ad November thayers sub-ad December thayers ad January thayers ad February thayers ad March thayers ad April thayers ad May thayers ad June thayers ad July thayers ad August thayers ad September thayers ad October thayers ad November thayers ad December	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 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. *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 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. 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 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). Thayer's Gull / Kumlien's Gull intermediate- juvenile 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 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. 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.
		Distribution of Thayer's Gull. Breeding areas, migration routes and wintering areas. FROM: *"Gulls of the Americas" by Steve Howell & Jon Dunn*.
		Distribution of Kumlien's Gull. Breeding areas, migration routes and wintering areas. FROM: *"Gulls of the Americas" by Steve Howell & Jon Dunn*.
		Distribution of hybrid gull taxa in Gull. Selected zones of hybridisation in the nortrh Pacific / Bering Sea region. FROM: *"Gulls of the Americas" by Steve Howell & Jon Dunn*.