They feed on tiny sea creatures by straining the water through the baleen that hangs from their mouth. The Finback is the second largest mammal in the world after the Blue Whale. Fins are torpedo-shaped and their bodies are smooth and streamlined. The front limbs are pairs of flippers and are used for steering. The dorsal fin is the tail fin and is a pair of horizontal flukes.
Fins have a longitudinal furrow on their rorquals.
The skin is gray to black on the body with white underside. Breathing is hard, a little for them, like one breath of the whale be made up of a fast explosion of air, which is up to 15 to 20 feet in the air. The spout of the Fin is when exhaled air is warm the outside air is giving the spout to jet out with steam, it comes out the blowhole, next. The blowhole is normally called the nostril. The fin weighs about 60 tons.