[SBB] Glaucous Gulls, Alviso EEC

["Steve and Heather Rottenborn" <[[email protected]]>]

This afternoon (21 Jan.) I checked pond A-16 near the S.F. Bay National 
Wildlife Refuge Environmental Education Center in Alviso, hoping to refind 
Al Jaramillo's Slaty-backed Gull.  No luck with that species, but there were 
three Glaucous Gulls (2 first-cycle and 1 second-cycle) among the 300 or so 
gulls roosting on the pond's southern levee.  The 2 first-cycle birds 
disappeared after a jogger flushed these birds, but the second-cycle bird 
hung around for over an hour.  Gulls were constantly moving from the Newby 
Island landfill to this pond, then westward over the railroad tracks, and at 
any given time there were 1,000-2,000 gulls in A-16 (predominantly 
California, Herring, and Glaucous-winged, but with good numbers of Western, 
Thayer's, and Ring-billed, and more than a few Mew and Glaucous-winged x 
Herring hybrids).

Steve Rottenborn
Morgan Hill, CA 


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