Yet, 70 million years ago, a truly colossal turtle, Archelon, dominated the seas. This magnificent creature, now long extinct, was the largest turtle ... turtle lived in a sea we now call the ...

The largest and heaviest specimen ever found had a shell length of 256 centimeters (8.4 feet) and weighed 916 kilograms (2019 pounds). Usually, the shells of sea turtles consist of horny scales.