I don't know how widely known it is, but after Sully's ditching New York City rounded up as many Canada Geese as they could, put them in a warehouse and gassed them. A despicable attitude, in my opinion. I understand EGLL has a number of strategies to deal with the problem, from the Landrovers equipped with PA to play bird alarm-calls to scare flocks away, to leaving the grass at such a length that birds are discouraged from landing there because they can't see approaching predators. Do airports share their ideas on this sort of thing, I wonder?