Another example of leucism in outer greater primary coverts in Lesser Black-backed Gull

I observed this first-calendar year Lesser Black-backed Gull today with conspicuous leucistic wing feathers:

First-calendar year Lesser Black-backed Gull with leucism in the wing. Leiden, 4 September 2012.

First-calendar year Lesser Black-backed Gull with leucism in the wing. Leiden, 4 September 2012.

First-calendar year Lesser Black-backed Gull with leucism in the wing. Leiden, 4 September 2012.

First-calendar year Lesser Black-backed Gull with leucism in the wing. Leiden, 4 September 2012.

This is yet another example where the leucism is mostly restricted to the outer greater primary coverts when seen in Lesser Black-backed Gulls.

Earlier examples that I have observed:

Green M.ABT. Adult Western Lesser Black-backed Gull (Larus fuscus graellsii) with one greater primary covert in each wing without any pigment. Interestingly, this individual did not show any leucism the previous season. Texel, The Netherlands, June 2011.

Adult Western Lesser Black-backed Gull (Larus fuscus graellsii) with several greater primary coverts in each wing without any pigment. Texel, The Netherlands, June 2011.

For more about leucism in gulls, see this blog post.

Advertisements

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