There was an article on this in the paper a week ago or so. It showed the statistics from the states that have this problem. But this article focused on the fatalities. Iowa is something like the 3rd worse from 2003 for vehicle animal collisions that resulted in death for one or more of the vehicles occupants.
The deaths were not caused by the animal going through the wind shield. But by the driver swerving to miss the animal at interstate & highway speeds, losing control & either rolling or crashing into something. The vehicles occupants were either ejected from the vehicle from not wearing a seatbelt. Or they were killed from a serious impact when the vehicle hit something. In most of the deaths, something like 60% the vehicles occupants were not wearing a seatbelt.
The Iowa Highway Patrol recommends that you do not swerve or veer to miss the animal. If you hit it you hit it. Try to come to a safe & controlled stop. It is better to hit the animal & suffer damage to your vehicle then swerve to miss it & end up at the bottom of a ravine, or crashed into a bridge column or another vehicle.