Combining techniques provides new insight into bird migration

Two complementary methods work together in a study forthcoming in The Auk: Ornithological Advances, producing more refined estimates of where individual Barn Swallows spend the winter. Using the methods separately comes with tradeoffs—one lets researchers precisely track a handful of birds, while the other provides data for larger numbers but with less detail—but together, they provide a fuller picture of an intercontinental migration.