The return of the prodigal swine

Wild boar Sus scrofa were early natives of the British Isles, survived through to Norman times as beast of the chase, and died out only 300 years ago, if popular mythology is to be believed. Now they are back, in a remarkable, unplanned. Reintroduction programme. Should conservationists be celebrating, or should biologists be heeding the caution of the veterinary world?