Most however winter in Mexico and South America. Make very long non-stop flights over ocean. In spring BW's move north to staging areas along Gulf coast, then directly to breeding grounds. Nest in meadows and hayfields. High densiity of nests makes it easy for predators.
Bluewings often feed with greenwings, but prefer more leafy parts of vegetation.
A western species, in central and western flyways. Probably around 260,000 adults. Breed almost exclusivley around Great Salt Lake in Utah, winter in Mexico. Used to be called baldpate. Uncommon to to rare in New England however.