I was photographing this Great Blue Heron years ago at a local park early in the morning. I was using a 100-400mm Canon Zoom @ 400mm. It is amazing what they can swallow. Here It seemed to go down quickly. Other times I have seen them take up to 20 to 30 minutes to get their prey down. Also they seem to eat a wide variety of prey. I have them eat snakes, gophers, rats and other prey you would think impossible to swallow! And you would think some prey would be painful to swallow!