Download or read book Bird Migration written by Thomas Alerstam and published by Cambridge University Press. This book was released on 1993-03-25 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bird migration is one of the most astonishing feats in the natural world. Millions of birds migrate, often over very large distances, to benefit from seasonal resource surpluses and to avoid predators and competitors. The aim of this study is to survey the phenomena.