human blood taste better
The Volturi are an ancient and powerful coven of vampires, something like royalty in humans. They operate from the city of Volterra, Italy. The Volturi have existed for at least three thousand years, if not more. They are the largest coven in existence, followed by Carlisle's family the Olympic Coven and Tanya's the Denali Coven. However, they do not follow a "vegetarian" diet, as seen in New Moon, in which they capture and murder several humans in a carefully planned "meal. They are considered the de facto royal family of vampires. The Volturi deal swiftly and decisively with anything they consider a threat to their city, or to the vampire world; for example they protect vampires existence in secret . They destroy anyone who attempts to overthrow them or resist their authority and, at Caius' insistence, have hunted werewolves (true werewolves, not shape-shifters) to near extinction in Europe and Asia.