I saw this Gull on Reddington Beach, a beach on the Gulf of Mexico, Central Florida. I spotted an adult Lesser Black-backed Gull and knew there was a Greater Backed Gull near. Maybe this relevant; maybe not. Unfortunately, I was not able to get a photo of this one near either which would have given us a better idea of size. This juvenile was a few inches taller than the Ring-billed Gulls that it stood close by.