That's the grape arbor in the background. It's loaded with grapes and there are tons of them for the birds. It's so funny to watch the robins, they move in and have their own private party. When one of us walks by on the way to the alley they either buzz us or chatter telling us that we're unwelcome guests at their little party!
Or they flap and take off fast to try to scare us away.
There's arguing among themselves, occasional singing and sometimes fights break out. Reminds me of people at a party. I'm glad to share them with the birds, it's worth the show. Diane