| Having 2 cats ( as I did until last year ) who were indifferent to wildlife, ( it was too much hassle to get up from a nice lie down ) , can be a good deterrent . Other cats in the garden were another matter and would be seen off in seconds - never understood but was grateful.
Cats also apparently dislike the scent of other cats and I know someone who was friendly with a keeper at a local wildlife park and used to douse the perimeters with Lion urine - infallible apparently , but - hazarding a guess, difficult and indeed dangerous to come by |