I thought I was getting good photos of an American Robin collecting nesting material. Then I looked and the legs were grotesque--like they were made of cottage cheese. Disgusting!
I believe that this is a scaly leg mite infection. It is cause by small mites--spider-like insects barely visible to the naked eye. They burrow under the scales on the leg. Mite infections are frequent among poultry and parrots and spread bird-to-bird or infest cages where birds are kept together.
|American Robin with scaly mite leg infection. Click for larger view. Escondido, California. April 15, 2016. Greg Gillson.|