I believe they can see bright fletching and will spook. It has happened to me more than once during archery season in the fall. Sitting in a treestand fully camoed from head to toe and motionless with my bow resting on my knee, I' ve had turkeys, especially gobblers, spook and run for no apparent reason. I have bright orange and yellow fletchings on my arrows though and a bow mounted quiver so I would recommend if you are targeting turkeys and are not in a blind of some sort, you need camo colored or dull colored fletchings for sure especially if you have a row of them lined up in a bow mounted quiver.