Mar. 22—With spring coming into full swing, birds will be migrating to Washington state, occupying residents' bird feeders. One bird in particular to keep an eye out for is the hummingbird. Hummingbirds are the smallest migrating bird, according to the Seattle Audubon Center. While in flight, their wings flutter up to 80 times a second in a figure-eight motion and up to 30 mph, according to ...