The Bloodhound is a large scent-hound, originally bred for hunting deer, wild boar and, since the Middle Ages, for tracking people. The second gene determines coat pattern. It can produce animals with no saddle (essentially all-tan, but called 'red' in bloodhounds); ones with saddle-marking; or ones largely covered with darker (black or liver) pigment, except for tan lips, eyebrows, forechest and lower legs. However man-trailing is enjoyed as a sport by British Bloodhound owners, through national working trials, and this enthusiasm has spread to Europe. In addition, while the pure Bloodhound is used to hunt singly, bloodhound packs use bloodhounds crossed with foxhounds to hunt the human scent.