http://news.bbc.co.uk/2/hi/uk_news/e...on/6688087.stm

They had a rather larger bird preying on cyclists over the pond. Maybe if you wore some sort of covering over your hair, or even over your helmet that might discourage it if it is going for your hair for nesting material. My mother-in-law had this problem in her garden for a while a few years back. They just wanted some gray hair for their nests.