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.
William Langewiesche discussed these birds and birds vs. planes in general in a piece he did for Vanity Fair titled
"Anatomy of a Miracle."