Hi, can anybody tell me what kind of bird this is, it has been flying around my pond & diving in & getting my frogs, it's irritating my ducks they chase it around the pond to chase it away but it's not really afraid of them it just goes to the other side of the pond to get away from them. It's actually pretty funny watching them chase this bird around but i'm afraid it might attack them it looks like it has a long pointy beak, plus I don't want it killing all my frogs & small fish. I thought it might be a woodpecker but it looks larger than the pics I saw of woodpeckers.