Field identification of Thayer's Gull (Larus thayeri)

• Main Authors: In Eastern North America, Michel Gosselin, David S
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1945
• Subjects: Arctic; British Columbia; Canada; Greenland; Pacific
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.690.2092; http://gull-research.org/papers/papers5/p01059-p01066.pdf

". one must check all the field marks to build a case for positive identification." Thayer's Gull (Larus thayeri) breeds in arctic Canada and locally in northwest Greenland and winters on the Pacific Coast of North America, mainly from southern British Columbia to California (Godfrey, 1966). However it also can be encountered in winter throughout eastern sub-arctic North America, as occurrences are attested by no fewer than thirteen specimens. Six of them were secured in the Niagara Frontier Region: single first-winter birds of undetermined sex on