Charlie Helms was golfing with friends at the Buffalo Creek Golf Course in Palmetto, Florida, when a large alligator walked across the fairway. How large was it? “Dave, get next to it for perspective!”
It’s a monster, but not unknown to the staff. A pro shop clerk said he’s between 15 and 16 feet long, and owned by Manatee County. He’s their course mascot. That’s kind of like having a dinosaur casually hang around for tourists to take pictures with. -via Buzzfeed
Also, their metabolism is quite low. A quick attempt at an estimate, using 5 kcal/kg body mass from a paper, gives something like 20000 Calories a week, which is how often they typically feed. That is only on the order of 5 kg of protein.
That said, this doesn't look like 15 ft long , and I wouldn't be surprised if it was just 12-13 ft. That is a size I remember seeing in the wild growing up in Florida, but not that frequently, and not around golf courses, which often remove gators once they get above 3-6 ft.