The Spiny Dogfish is a small shark species found in temperate waters around the world. It typically grows to about 2 to 4 feet in length and is recognized by its slender body and two dorsal fins, each with a sharp spine. These sharks are often grayish-brown with a lighter underside, helping them blend into their surroundings. Spiny Dogfish are known for their schooling behavior, often found in large groups. They primarily feed on small fish and invertebrates, using their sharp teeth to catch prey. This species is also notable for its long lifespan, living up to 25 years in the wild.