Turtles are an endangered species that are important for ocean health and producing over half of the world's oxygen. They are native to the Pacific Northwest but have been threatened by predators like non-native tortoises released by pet owners, as well as the destruction of wetlands and dams that deprive turtles of habitat. If turtles disappear, it could profoundly affect ecosystems around the world. Efforts to save turtles include cleaning the oceans by reducing litter and being careful with turtles.