Artist, ornithologist and author, Donald Watson has made an especial study of the Hen Harrier Circus cyaneus over many years and his field notes and sketch books of this exceptional bird of prey go back to the 1940s. The book opens with the world distribution of the harrier family, then there is a fuller treatment of the Hen Harrier in Europe and North America (the Marsh Hawk), its history and present status. Further chapters detail hunting methods and prey selection, the breeding cycle, migration and distribution.