Niagara Falls International Airport    (Town of Niagara)  The expansive, open, grassy fields associated with this small airport and the adjacent U.S. Air Force property make this one of the best locations in western New York to observe snow owls during winter months (November through March).   As many as 10 snow owls have been observed here at one time (during an "owl irruption year"), and at least one is reported from here each year.  Other raptors that can be seen here commonly throughout the year include red-tailed hawk, northern harrier, and American kestrel.  Uncommon grassland songbirds such as the upland sandpiper and grasshopper sparrow can be observed here May through August.   Access restrictions associated with the Air Force Base limit bird-watching to the area surrounding the airport tower (off Niagara Falls Blvd. at the south end of the site) and along roads bordering the site.