Okay, this picture is actually part of a series of pictures, which are also tragic, but not at all related to gum. The bird that is alive is the male, and the dead bird is his mate. She was hit by a car. The male ran around her to "defend" her, squawked, and prodded her trying to revive her.
Had nothing to do with gum. Just a grief-stricken male at the loss of his mate, ready to take on the traffic.