It is a brown headed cow bird. A very interesting blackbird that you have nailed a fantastic close-up of Bob. The female doesn't build a nest but instead deposits its eggs in another nest for a foster parent to raise. They just want to have fun without the pressures of parenthood I guess.
This is so instructive to have all the clever members [chiefly from SOS ..:)] around. I would not have to admit to being ignorant about birds and other things:) Love this bird here with an interesting and slightly disputable approach to parenthood:) SAM & SAAB
Very good shot.
TicK
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