Many species of turtles, such as the Green Sea Turtle, are herbivores or omnivores with a primarily herbivorous diet. Various species of fish, like surgeonfish and parrotfish, consume algae and plants, making them herbivores. While most marine mammals are carnivores or omnivores, some, like dugongs and manatees, are strictly herbivores. Furthermore, viviparity, meaning giving birth to live young, is common among many snake species, with ovoviviparity also occurring, contrasting with egg-laying in other reptiles.