Snapping Turtle (Chelydra serpentina). Snapping turtles are found throughout the United States. They have a lifespan of 30 to 40 years. They can attain a shell length of 20 inches and weigh up to 35 pounds. Their serpentine neck, massive head, muscular legs, and relatively long tail make them seem even larger. They eat almost anything, from frogs, crabs, snails, and insects, to vegetable matter and water fowl. They capture prey with a blindingly quick thrust and neck expansion and adults will drag down live prey into the water to drown.