The reason they are coming toward you is because they are bored out of their minds and your arrival is the most interesting event this week. (Not that they think in terms of weeks, of course).
http://news.bbc.co.uk/1/hi/wales/8216869.stm
WALKERS WARNED OVER COW DANGER: Farmer Ed Rees, of NFU Cymru, gives advice on how to avoid cows stampeding....