The type of Canada geese that brought down Sullenberger's plane are partly a man-made problem since they were largely bred to boost hunting license fees. Along the way, they lost their migratory instincts and are now a year-round nuisance at airports like LGA.
While this is no doubt a legitimate concern, I understand that the offending birds in this case weremigratory.
Migratory Geese Downed Flight 1549 in Hudson River