From a Wall Street Journal review by Christoph Irmscher of the book by Rebecca Heisman titled “Flight Paths: How a Passionate and Quirky Group of Passionate Scientists Solved the Mystery of Bird Migration”:

Birds, like humans, follow the rhythm of the seasons. Yet as the nights grow longer and the leaves begin to turn, many of them take off, reminding us that what is home for us was, to them, just a place to raise the kids. The questions that puzzled generations of observers—where these birds went, what they did there, why some migrated and others did not—have mostly been answered by modern science, as Rebecca Heisman’s illuminating new book “Flight Paths” suggests. But the mystique remains.