Mew Gull

A large flock of Mew Gulls (Larus canus) spends the winter at the waste water treatment plant in Forest Grove and at adjacent Fernhill Wetlands (Birding Oregon p. 61).


Mew Gulls look like a petite version of Ring-billed Gulls, with a round head, big eyes, and fine yellow bill.


Adult Mew Gulls are easily recognized in flight by the large white mirrors on the outer two primaries. Ring-billed Gulls have a smaller white mirror on the outermost primary (P10) and a tiny one on P9. You wouldn’t think the size of the white spots on two feathers would make much of a difference in identifying a flying bird, but it really does.


The bird in flight is a second-cycle Mew. He/she has lost the brown plumage of a first-cycle bird, but the tail still shows a broken blackish band, and the primaries (and primary coverts) have more black than those of an adult. Notice the small white mirror on P10 and little or no white on P9.

Advertisements
This entry was posted in identification challenges, species profile and tagged , . Bookmark the permalink.

One Response to Mew Gull

  1. Pingback: 19th March 2010 – Putative Mew Gull in Leicestershire | Binocularface.co.uk

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s