The Basenji is a breed of hunting dog that was bred from stock originating in central Africa. Most of the major kennel clubs in the English-speaking world place the breed in the Hound Group; more specifically, it may be classified as belonging to the sighthound type. The Basenji produces an unusual yodel-like sound commonly called a "barroo", due to its unusually shaped larynx. This trait also gives the Basenji the nickname "Barkless Dog". Basenji are small, elegant-looking, short-haired dogs with erect ears, a tightly curled tail and a graceful neck. A basenji's forehead is wrinkled, especially when the animal is young or extremely old. Basenji eyes are typically almond-shaped, which gives the dog the appearance of squinting seriously. Dogs typically weigh 24 pounds (11 kg) and stand 16 inches (40.6 cm) at the withers. They are typically a square breed, which means that they are as long as they are tall. The basenji is an athletic dog and is deceptively powerful for its size.