Thayer's Gull Wingtips - Variation

Photo 1. Adult female Thayer's Gull in the Collection at Royal Ontario Museum in Toronto

 

Photo 1. Adult male Thayer's Gull in the Collection at Royal Ontario Museum in Toronto

 

Photo 1. Adult male Thayer's Gull in the Collection at Royal Ontario Museum in Toronto

Click on photo above or on this link to Thayer's Gull Wingtip Patterns in Howell and Elliott's article

Identification and Variation of Winter Adult Thayer's Gulls in Alula Vol 7 2001.