I have the three piece gator, got it after the heron quit visiting, have not put it into the pond. It is listing to the side and too low in the water, tried to get the company to help with getting a new one, no luck. I need to fix it with some foam or cork glued below to make it float right. The gator head is around 2 feet long, I have hours of records watching the heron checking out the gator. It would stare at it, circle the pond looking at it the whole time. Poor bird could see the fish swimming, you could tell it sure wanted the fish, but it would give up and head out into the gardens. The head is anchored to a rock with a 7 foot piece of fishing line, it moves in the wind and with the water current constantly.
The second head was placed among the lilies sort of anchored in them like a still hiding gator. Not enough clear water for it to move around, once the lilies grow
I think the moving one was a lot more effective.
Before the gator head the bird would walk the pond checking out every inch of the chicken wire fence looking for a way in. It did fly in one time, landed with a huge plop, got its feet tangled up in some fishing line, took off without a fish, before the gator head. Since the gator head never flew in again. With it wing span it needs room to fly in and land. So I put one piece of deer fencing down the center of the pond, which keeps it from being able to fly in and land if it decides the gator is safe.
The heron has not come back this year except once in january, flew in and flew out, I didn't see it when it landed in the field and was walking out of the house, it took off right away.