Sitting on rocks and high points on the paths the leeches squirm and stretch up in the air waiting for warm blooded animals (aka. me). Once close enough they bend and attach themselves to the feet. From where they proceed up the gaiter to unexposed virgin skin. Once they find a weak spot they pierce the skin and start sucking. Until the blood is oozing out of their pores at which point they detach. Leaving a lovely mess like this.