Diseased Bird: A Sick Blue Jay

This Blue Jay appeared at my feeding station this past summer for a period of 3 days. It appeared to be very sluggish and “not with it.” It would sit still for hours in one of my hanging platform feeders and go back and forth between dozing off and pecking occasionally at the seed inside. It would also exhibit the same behavior on the ground. On the last day that it was at my feeding station it allowed me to walk so close to it that I could’ve picked it up. At that point I knew something was wrong. It’s eyes were opening and closing and it had this abnormal lump on it’s upper back. I never saw it again after that day.