Cornell Lab Bird Cams on Instagram: "Common Grackles showcase their shimmering plumage in a face-off at the Cornell FeederWatch Cam. Two males begin with "bill-up" displays, a threatening posture with bills pointed to the sky. They then exchange "song spread" displays—fanning their tails, raising feathers, and singing. You might see male Common Grackles in your area perform these behaviors intensely during the early breeding season. Watch them LIVE at AllAboutBirds.org/CornellFeeders"