Diplodocus is a very famous giant Jurassic plant-eater. It was a huge, long-necked dinosaur, almost 100 feet long! In fact, it is the longest complete dinosaur skeleton ever discovered. Since its hind legs were longer than its front legs, this tells us that Diplodocus probably ate plants that were low to the ground. It was so big, however, that it could push trees over in order to get the leaves at the top down to the ground! It would probably stand on its hind legs to push, but it could not hold that pose for very long.

Like many other large sauropods, Diploducus probably swallowed stones which it kept in a gizzard similar to that found in a chicken to facilitate digesting food. The tough plant fibers would spend time in the gizzard stewing and being ground up by the stones. There is some speculation about the use of the very long tail of Diploducus and other members of its family. If it was used as a weapon, it would be very deadly. Because of its length, the speed at the tip, if swung forcefully, would have been very high, possibly faster than the speed of sound.

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