Follows a safari team led by Dr. Richard Estes as they track one of the largest land migrations--wildebeests crossing the Serengeti--with information on other a

Tiny ruby-throated hummingbirds weighing less than a nickel fly from the upper Midwest to Costa Rica every fall, crossing the six-hundred-mile Gulf of Mexico wi

Animal migration is a magnificent sight: a mile-long blanket of cranes rising from a Nebraska river and filling the sky; hundreds of thousands of wildebeests ma

An illustrated companion to the seven-hour National Geographic Channel special miniseries of the same title. It includes 250 breathtaking photos and describes a

Since the arrival of the Puritans, various religious groups, including Quakers, Jews, Catholics, and Protestant sects, have migrated to the United States. The r