Tri-colored Blackbird
(Agelaius tricolor)
Photographed in California, by Jim Rosso
If you look very carefully you can some of the birds in the air and on the ground with white borders to the red shoulder mark, making them Tri-colored Blackbirds.

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Other members of the genus Agelaius:
Red-winged Blackbird
Red-winged Blackbird #2