Possible Glaucous Gull at Fenton Pond

I birded Fenton Pond Saturday morning, March 7, 2020.  At about 10:05 AM, a large white gull and 5 adult Western Gulls landed on the pond for a few minutes before taking off.  The large white gull looked good for 1st Winter Glaucous Gull: larger than the nearby Westerns, white plumage including white wingtips, pink legs and large bill; however, my impression of the bill was 2-toned but mostly black, not pink with a well-defined black tip.  Because of that, I hesitate to identify it as Glaucous Gull, considering the possibility of a hybrid or a very pale Glaucous-winged Gull.  No photographs.

Fenton Pond is located in Otay Valley Regional Park in the southwest Chula Vista area and can be accessed from Beyer Blvd.

Jeremiah Stock
Santee, CA
jscls@… 
Source: SanDiegoRegionBirding Latest Reports