During migration season this past fall, researchers at the Cornell Lab of Ornithology, using Nexrad weather radar, tracked approximately 4 billion birds migrating from Canada into the U.S. and 4.7 million birds leaving the U.S. for the tropics. Clearly one strategy for dealing with New England weather is to leave it behind. But other species’ strategies have traded the benefits and perils posed by thousands of miles of travel for the benefits and perils of northern winters.
