My cats are indoors. However we live in the woods so we have abundant wildlife. I've taken to chucking my birds' bowl contents out the front patio whenever I'm cleaning cages and feeding. The wildlife love it. So do the kitties. My patio doors are like a GIANT flat screen TV full of chipmunks, squirrels, birds, and rabbits
As I type this they are currently mesmerized by a rabbit chasing a chipmunk.
He is total garbage! Quick! Hide him on my trailer (Petstorejunkie).
I have a bird feeder hung on my apartment balcony for that very reason, I live on the second story, so in the mornings before work the cats can go out on the patio and watch the birds, they even seem to have figured out that if they move too fast the birds fly away, so they hunker down under the patio furniture and sit still so the birds stay to eat longer. I love it for them.