Hello @agmoore . Very interesting and detailed your post about the feeding habits of the gulls in your locality and they are a product of your observation.
Gulls survive by their diverse foraging, even in the waste left by humans. I have seen this behavior in black and white herons that are constantly in the garbage dump of the residences where I live and a few years ago this did not happen. It seems to be a survival strategy due to the loss of natural places.
Thank you very much for sharing this information.
Happy day!