Nice capture. These look like they are still a bit immature as they still have a bit of their brownish feathers and their bills are still a bit orange in colour.
Gary A. The one with one leg has the other leg tucked up into its body. They often rest like this - on one leg. Having been there a few times, I find they are very good at avoiding the 'gators and even when they are in the same stretch of water, the 'gators seem to ignore them.