Turtle
The largest chelonian is a marine turtle, the great leatherback sea turtle, which reaches a shell length of 200 cm (80 inches) and can weigh over 900 kg (2,000 lb, or 1 ton). Freshwater turtles tend to be smaller, with a few exceptions. The largest species, the Asian giant softshell turtle Pelochelys cantorii, have turtles that measured up to 200 cm or 80 in (Das, 1991). This is bigger than even the better-known alligator snapping turtle, the largest chelonian in North America, which reaches a shell length of up to 80 cm (31 in) and a weight of about 60 kg (170 lb).