I've hit three over the years. They are remarkably unpredictable in their actions.
One bounced off my helmet, he was part of a flock eating a dear carcass on the side of the road. I was riding a Honda Blackbird with a tank bag and I couldn't duck behind the screen because of the bag.
Another took the right mirror right off my Gold Wing. It broke an aluminum mounting bracket right where the bolt goes through to secure it to the bike. This one was flying along side me about 100' off the road and did a 90 degree turn across my path.
The third hit the windshield on the wing, but didn't do any damage. From my experience, the bird doesn't weigh enough to crash a bike as long as you don't take radical evasive action.