a fine book on bird migration

I've been reading a fine book, Songbird Journeys, by Miyoko Chu, published in 2006 by Walker & Co., New York. Even if you're an advanced birder who has been studying and reading about migration for a long time, you will find something of interest in this book. Along with a description of many research projects focused on bird migration, there are sections on migration "hot-spots", citizen-science, resources, a detailed bibliography and notes.