During a ride to Texas last year I bounced a mourning dove off the helmet. Luckily it was an "overtake" collision instead of a head-on. Not long after I did smack a sparrow head-on, where it wedged itself thru that small gap between the bottom of the windscreen and fairing. It rode there for a while til I could stop and fish it out.
What was worse was on the way home hitting a bee that ended up under my helmet strap where it decided to sting the crap out of my neck... while at speed! Talk about diverting your attention from the road.
The birds I saw... the bee I didn't. But jeez, it hurt like hell the rest of the way home.
I've done the bee thing - up under the chin it came - I was off the road FAST and in the gravel slope gloves flying, glasses flying, helmet off bee twitching. . . no sting tho - just a stunned crawler. . . A country road with no shoulder to speak of.
Large flying beetles and butterflies seem impair vision horridly. Since then and swarm of nats making splat on the visor I carry ziplock bag with soapy cloth and a dry cloth for clean up.