3rd-winter Thayer's Gull
This bird was photographed at Half Moon Bay, California during the late afternoon of 22nd February 2013. Though there is a fair bit of variation in this age, this bird is what you'd deem a 'classic' - the dark, speckled iris on this bird (some birds of this age can have pale irises, just like some adults), blackish subterminal bill band and adult-type primaries.
|Note the well proportioned look to this bird, typical of what would be deemed a 'classic' Thayer's Gull. Deep pink, relatively short legs and mid grey mantle (slightly darker than Herring Gull)|
|primary-coverts still showing signs of immaturity, with black on P5-P10 and mirrors on P9 and P10|
|note the pale underside to the primaries, with just P10 showing an obviously dark tongue bleeding down on the leading edge from a large white mirror, and P6-P9 all pale tipped subterminally marked by small dark bands|
Near-adult Thayer's Gull
Like the age detailed above, there were very few - just a couple - of near-adult Thayer's Gulls seen all week. This bird was on the beach at Jenner on 17th February 2013. A relatively large, snouty individual it was pretty much like an adult except for the dark on the gonys.