How do I "shoot and kill 5 rabbits" for the Sharpshooter challenge?

Solution 1:

I found 5 rabbits to shoot without too much trouble wandering around the Warthington Ranch. There seems to be a fair amount of smaller animals running around here most of the time.

Here is a link for wiki about the Rabbits.

Locations in accord with wiki:

• They can be found in the plains of Armadillo and other grassy, scrub-like areas.
• Rabbits are most common around The Hanging Rock just north of Armadillo, where they are most often seen at around 6 PM.
• Rabbits can also be found to the road that leads south of Warthington Ranch, along the river. They appear to be along the road in the morning. (8:30am onwards.)
• They can be found in certain rooms of the Tumbleweed mansion.