We all know Cuckoos as the harbingers of spring - whose haunting calls proclaim the birds own name across fields and reedbeds. A bird much more often heard than actually seen, and often mistaken for a hawk or falcon when briefly glimpsed in flight. Cuckoos are also well known, perhaps even infamous, for their habit of laying their own eggs into the nests of much smaller species, such as reed warblers, who are then doomed to raise the enormous cuckoo...