If only we could get a big Wels Catfish. Those things would eat the herons. I guess Florida and south Louisiana ponds would be free of herons if an alligator lived in the pond. LOL
Don't count on that. When I was in FL I noticed Blue Herons right along right along side the alligators. I had wondered why, thinking like you said. Then at one area I seen why. An alligator was next to a blue heron with it's eyeball plucked out and still dragging along 2' away with the retina cord still attached. Thought to myself, "that's why you don't mess with a blue heron!!!!". I have a picture of that somewhere.