If it was a biologist I doubt he worries about getting hit by a bird, peregrine or raven. They don't actually hit all that hard, more of a surprise since they are both large birds - a three foot wingspan rocketing at you at warp speed is kind of unnerving. But you get used to it. And all you really get are scratches which you really don't realize you have until after the event. Since one automatically protects their eyes no real harm done. Some birds come closer than others, some come close enough to actually come into contact, most don't. That applies to all species. Been hit by robins more often than raptors, crows, ravens and other large birds.
And no, I don't wear a helmut anymore - did in my first couple of years but gave it up when I whacked myself more than the birds hit me!
