At up to five feet long and between 300 and 400 pounds, green sea turtles are one of the largest species of sea turtles. A rescued green sea turtle is examined at the New England Aquarium’s Sea Turtle Hospital. The Aquarium’s Rescue and Rehabilitation team also spends several months every year caring for sick and injured green sea turtles at its Sea Turtle Hospital in Quincy, Massachusetts. In June, 17 endangered and threatened sea turtles were released into the waters off Cape Cod, including three green sea turtles. Additionally, there are seven living species of sea turtles, with two listed as Critically Endangered (Hawksbill and Kemp’s Ridley sea turtles).