0Sea Turtles Circle is the third book in Patricia Gleichauf's Under the Sea series. Children of all ages will find fascinating facts about sea turtles in this book. Like her award-winning books Horses of the Sea and Starfish Gazing, Sea Turtles Circle is a rhyming lesson about an incredible saltwater animal. Sea turtles are vulnerable and endangered. Plastic bags, bottles, straws, and cup lids are a danger to them. One way we can all help save sea turtles is to avoid using plastic while visiting the beach.