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Field Sparrow Images


William Bouton
 

I have posted two images of the rarity discovered by Jim Royer today at:


The bird has an apparently tumorous growth beneath its mandible. I have seen similar appearing growths on other birds, particularly on gulls:


and wonder if anyone can tell me more about what it is I'm seeing on these birds.

Bill Bouton
San Luis Obispo, CA 93401 USA