The fortunes of the Peregrine Falcon, Falco peregrinus, this century, especially the pesticide-induced decline of the 1960s and subsequent recovery, have been well documented (Ratcliffe 1980, 1993) and often retold. That the species’ population has reached almost unprecedented levels in Britain is already apparent, and we approach the end of the century with further expansion, in both breeding range and numbers, in prospect.