Geese are a real problem around airports, and some airports have river or lake frontage to make the problem more acute.
I flew banners out of Renton, and the airport staff used explosives, trained dogs, etc to run the geese off. It dd not work well. There was goose poop all over where we set up signs.
One day I was coming in to get a banner and something spooked the geese at the shoreline. One flew up at me as I was descending with the 4 pound "treble hook" we used to grab the signs dangling below and behind me.
I powered up and pulled up hard to avoid the collision. According to witnesses on the ground, the grapple hook made a direct hit, and the goose went into the lake like a lawn dart. We all secretly cheered
