Dusky smooth-hound fishes is their ability to continually replace the teeth in their upper and lower jaws. Smooth dogfish differ from other sharks because of their 10 rows of flat, blunt teeth. The teeth in the upper and lower jaws are similar in size and are asymmetrical with rounded cusps. These teeth are used to crush and grind food, rather than bite it. Their unique dentition is important for their crustacean-based diet. In smooth dogfish, tooth replacement is related to body growth. They grow about 10 cm per every six rows of teeth replaced. That is an increase of 0.03 mm per
Serbian Hound Serbian Hound The Serbian Hound (/"srpski gonič"), previously known as the Balkan Hound (Serbian: балкански гонич/"balkanski gonič"), is a pack hunting dog breed used in Serbia. It is red or tan with a black saddle, neck and cranium and red or tan face. Its head is flat and sloping, its muzzle pointed, with drop ears of the usual scent hound type. The Serbian Hound stands 17 to 21 inches (44–56 cm) in height and weighs about 44 pounds (20 kg). It is smooth-coated and coarse-haired. Described as pleasant natured and obedient, the breed is thought to descend from dogs left