The skull and skeleton of E. annectens are well-known. Edward Drinker Cope estimated the length of one specimen as about 38 feet (12 m) long, with a skull 3.87 feet (1.18 m) long.[2]* This body length estimate was later revised down to a length of 29 feet (8.8 m),[3] although to be fair to Cope a dozen vertebrae, the hips, and thigh bones had been carried away by a stream cutting through the skeleton, and the tip of the tail was incomplete.[4] A second skeleton currently exhibited next to Cope's specimen, but in a standing posture, is estimated at 30 feet (9.1 m) long, with its head 17 feet (5.2 m) above the ground.[4] The hip height of this specimen is estimated as approximately 2.1 metres (6.9 ft).[5] Other sources have estimated the length of E. annectens as approximately 12 metres (39