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
Halden Hound Halden Hound The Halden Hound (), is a medium-sized Norwegian dog breed of the hound class, used for hunting hares and other plains quarry. It resembles an American Foxhound but is smaller. It was named after Halden, a town in southeastern Norway. The Halden is similar to the American Foxhound in appearance although it is smaller. Haldens stand between 17 and 21.5 inches at the shoulder, and weigh approximately 40-55 lbs. They have smooth, very dense coats, hanging ears, and are white with black patches as well as brown shading on the head and legs. They are strong dogs with