Sea Cows : Gentle Grazers of the Underwater Meadows Gliding silently through warm coastal waters, like living submarines cloaked in thick, wrinkled skin, sea cows are among the ocean’s most serene and mysterious inhabitants. They do not leap or chase or roar; instead, they float with grace, grazing on underwater grasses with a tranquil determination that seems to defy the pace of modern life. These gentle marine mammals, formally known as sirenians, have enchanted sailors, inspired mermaid ... Dugong in Andaman and Nicobar Islands. Dugong is the state Animal of Andaman and Nicobar Islands. Sightseeing of Dugong during scuba diving in Andaman Islands. Find where dugong can be sighted in Andaman. The Sirenia (/ saɪˈriːniə / sy-REE-nee-ə), commonly referred to as sea cows or sirenians, are an order of fully aquatic, herbivorous mammals that inhabit swamps, rivers, estuaries, marine wetlands, and coastal marine waters. Dugongs (Dugong dugon) are the only herbivorous mammal s found in India’s marine ecosystems. Appearance: It is known as the sea cow , but resembles a cross between a seal and a whale, and is distributed through the Indo-Pacific region.