Every fall, millions of hawks, falcons, eagles and other birds of prey move south across North America. Some gather in enormous kettles, while others follow ridges, shorelines and mountain passes alone. Learn when hawk migration begins, why weather matters, where to watch and how to recognize migrating raptors by shape and behavior.

Most birders know the Red-tailed Hawk—but few realize how many different forms exist across North America. From the familiar Eastern Red-tail to the pale Krider's Hawk and the mysterious Harlan's Hawk, discover why one of our most common raptors is also one of our most fascinating.