A seal is a wild animal that spends most of its life time underwater. Seals are big animals that can be as long as 5 m (16 ft) or as heavy as 3,200 kg (7,100 lb). They have smooth, plump and streamlined bodies with four flippers, which look like long and flat feet used for swimming. Their fur coats’ colors vary from white and grey to black and brown. The seals’ ears and necks are not visible at all. Their eyes are rather big and prominent while their heads are small and rounded with short snouts, V-shaped nostrils and long, multiple whiskers. The fur is short and the skin is pretty thick and fat. There are many species that belong to the group of seals, such as a walrus, sea lion, harbor seal and many more. The walrus is one of the biggest seals, which is unique for its tusks. The sea lion has longer front flippers than other seals, while the harbor seal is the most common seal.