Come visit our Marine Mammal bookstore . This section is dedicated to marine mammals.
Marine mammals are our closest relatives living in the sea.
Though they currently reside in the ocean realm, all marine mammals were once land dwellers. The marine mammals, like all mammals, developed from mammal-like reptiles called therapsids. At some point in their life history certain mammals ventured into the sea. This was probably due to competative pressures. At first these mammals were probably scavengers, finding food wherever possible.