Plant dense, heterogeneous local species in your garden, don't use herbicides or pesticides, and avoid prolonged or regular use of outdoor artificial lighting.

Plant dense, heterogeneous local species in your garden, don't use herbicides or pesticides, and avoid prolonged or regular use of outdoor artificial lighting. Don't feed wild birds. Don't let cats out. If you have neighbours with cats, spray them with a hose until they learn to stay away. If that fails, trap them then spray them with a hose. That'll learn 'em.