Easy to enforce: cull all the stray cats (that kill all the small wildlife and especially birds) --> any stray cat is captured and euthanised unless they are chipped. Chipped cats are checked for a shot, returned to their owners and the owners are fined.

Solves the problem of stray cats, ensures cat owners will want their cats to be chipped, and deals with noise pollution + allows small wildlife to breath in relief because there's one less predator around.