I have a Daisy .22 cal pump-action. It will easily kill jackrabbits at 100 feet....easily. So extrapolate that to other animals and I think it would do just fine.

There was a thread here awhile back about airguns and the Sheridans were so highly touted I had to look them up. They aren;t much more expensive than a Daisy or Crossman (IF they're even AS expensive), so I might look into one someday.

You can get the Daisy's and Crossman's at Walmart. Don;t discount them, they're deadly. Especially the models like mine that allow you to pump up the weapon to increasing levels (up to 10 pumps I think). They don;t injure rabbits, they kill them dead, even with body shots (well, within reason). Get one that's pellet-capable, wether .177 or .22. I've had both and I like the .22 spear-point pellets.