This is William "Billy" Windsor I, a goat who served as a lance corporal for the British Army from 2001 to 2009 (except for a short period when he was demoted to fusilier because of inappropriate behaviour during the Queen's Official Birthday)
It never ceases to amaze me both how they are able to fit their mouths around their prey and also how they are able to digest hair, bones, teeth, cartilage and the rest!