Make way for the green sea turtle, which you’ll find—if you’re lucky—swimming in tropical and subtropical coastal waters around the world. You’ll notice that despite its name, the green sea turtle’s shell is not green at all. The name comes from the color of its fat, which takes on a greenish hue after the adult turtle starts eating seagrass and algae. Unfortunately, like many other sea turtle species, the green sea turtle is endangered and its population shrinking due to hunting, boat-propeller accidents, plastic pollution, and loss of nesting grounds.