Introduces the migration patterns of monarch butterfies, describing the vast distances they cover, why they migrate, and the dangers they face along the way.

Introduces sperm whales, including their different body parts, how they travel in groups, what they eat, and how they care for their young.

Originally published in 1950, this is a comprehensive account of the peaks and troughs of migrations to America, beginning with its original formation of the nation through to the influx of Displaced Persons. Relating the American migrations to great movements in world history on the one hand, and to the national ideal of freedom on the other, the author discusses national and cultural migrations specifically-the French, Dutch, Norwegians, Swedes,...