When we first moved to our new house it was not the migratory season of birds. When that came later in the year, we had a huge flock of geese land in our back yard. I had never seen anything like it. They really leave a mess. I know they are not trying to be a problem. They just liked the big open space of our yard to land in. We had to call a company that helps with Canada geese control in NJ to come up with a safe solution to discourage them from landing in our yard.
The biggest problem was that they poop a lot. And it is not like regular bird droppings.