Most common comprehensive claims: Glass claims and then accidents with deer are the most common. If you live in Arizona or another desert state, you're at a much higher risk for glass claims as rocks are frequently kicked up by cars. Deer accidents are most common in West Virginia and other central/non-coastal states, specifically if you live and drive in a highly wooded area.
Comprehensive insurance is commonly confused with collision. They both insure your car but cover different events. Collision covers car accidents, and comprehensive covers events out of your control. Think of it like this: Collision is colliding with something else (other than animals). Comprehensive is basically all other events. Accidents with animals are covered by comprehensive (and not collision) because these accidents are considered out of your control.