Say Goodbye to the Cuckoo

If we could see it as a whole, if they all arrived in a single flock, say, we would be truly amazed: sixteen million birds. Swallows, martins, swifts, warblers, wagtails, wheatears, cuckoos, chats, nightingales, nightjars, thrushes, pipits and flycatchers pouring into Britain from sub-Saharan Africa.

It is one of the enduring wonders of the natural world. Each bird faces the most daunting of journ...