A Bloodhound (also known as the St. Hubert Hound) is a large breed of dog bred for the specific purpose of tracking human beings. Consequently, it is often used by authorities to track escaped prisoners, missing children, or earthquake victims. It is a scenthound, famed for its ability to follow a scent many days old, over vast distances. It possesses the keenest sense of smell of any breed of dog, as well as an extremely strong tracking instinct. Bloodhounds are one of the most affectionate and friendly breeds of dog, known as "Gentle Giants."