Shotguns are generally used to hunt small and moving animals. This includes things like rabbits, squirrels, and most birds. They are used because the spread of multiple pellets is more likely to hit a small moving target than a single bullet would be. They are also safer for shooting flying birds because the pellets only travel a few hundred yards, compared to a mile or more for most bullets. Birds, rabbits, and other small animals are more valuable due to their complexity in hunting. A shotgun is a great helper to hunt them down.