Identificaciones de onthelabel

this bird is singing in the Eastern Cottonwoods present on the site. It seems to have a circuit that it flies, which thankfully brings it to the trees on the edge of 87th near the fire hydrant. Typically, I have no problem walking in here, but the CPD officer at the entrance to Steelworker's Park was keeping an eye on me, and it is posted "No Trespassing." No matter where it was inside the site, you could hear it singing.