This book is about the systematic or scientific study of bird migration - a chapter in the history of ornithology. The four individual ornithologists, pioneers of bird migration research, who feature prominently in it were active at the end of the 19th and the start of the 20th century. The work of these four pioneering individuals was shattered in 1944-1945 by the Second World War, but these losses were made good as this book explains.
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