We've had problems with them, about 15 of them, they leave behind a huge amount of droppings each per day. We put up a barrier (short wire garden fence) to deter them from the lawn ( they don't fly this time of year due to molting and want an undeterred route to the water. They are aggressive if they think you are afraid of them. Stand your ground or advance on them and usually they will retreat. A stick or shovel in hand can be used to herd them, I wouldn't whack one though, they are pretty fragile and I'm sure it is against the law to hurt them. They can nip and know where to bite if you know what I mean so be careful, but once they know you are not afraid of them they will run. I think New Hampshire will be naming them the state bird pretty soon.
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