Spotted hyenas are the largest of three hyena species. Spotted hyenas have good hearing and sharp eyesight at night. They are fast and can run for long distances without tiring. Packs work together effectively to isolate a herd animal, sometimes one that is ill or infirm, and pursue it to the death. The victors often squabble over the spoils, either among themselves or with other powerful animals like lions. Spotted hyenas are quite vocal and make a wide variety of sounds, including the "laughing" that has long been associated with their name.