ensioner William MacKenzie, 68, has appeared at Shrewsbury Magistrates Court. accused of threatening birds -- including three owls and a hawk -- with a petrol-powered LAWNMOWER. He denied 10 animal welfare charges when he appeared at Shrewsbury Magistrates Court on Tuesday. The court heard neighbours filmed him brutally attacking the birds of prey in the back garden of his home in Shrewsbury, Shrops, last June. Shocking footage appeared to show bearded MacKenzie striking and kicking several birds of prey, including a snowy owl and an African spotted eagle owl. MacKenzie, who has 30 years of experience handling birds of prey, claimed he cared for the birds which had been abandoned or injured by cars.