In recent centuries, the range of wild boar changed dramatically because of hunting by humans. They probably became extinct in Great Britain in the 13th century: certainly none remained in southern England by 1610, when King James I reintroduced them to Windsor Great Park. This attempt failed due to poaching, and later attempts met the same fate. By 1700 there were no wild boar remaining in Britain.
Beneath this trees it was pretty much impossible to see the boar with the naked eye. All I had to go on was the sound, and a bit of luck with the manual focus. It would be nice to be able to take some daylight shots, but the boar are increasingly nocturnal, which is probably a good thing, photography aside.