Dugong dugon
The dugong is a marine mammal related to manatees and the only strictly marine herbivore, grazing seagrass meadows in the Indo-Pacific. Its fluke-like tail and downturned muzzle suit a life spent hovering over seagrass beds, and it can live 70 years. Females raise a single calf every few years, so populations recover slowly. Boat strikes, gillnets, and seagrass loss have eliminated dugongs from much of their former range.