Diplodocus

Diplodocus was about 24 to 26 metres (79 to 85 ft) long and weighed around 12 to 15 metric tons (13 to 17 short tons). That is as long as two school buses parked end to end.42

Diplodocus was an herbivore that ate soft plants and leaves from trees. It used its small, peg-like teeth to strip leaves off branches.24

Diplodocus lived during the Late Jurassic period, about 152 to 145 million years ago.24

Diplodocus fossils have been found in North America, especially in the mid-western United States, in rocks of the Morrison Formation.42

Yes, Diplodocus was much longer than T. rex. While T. rex was about 12 metres (40 ft) long, Diplodocus could reach 26 metres (85 ft) or more. But T. rex was heavier and more heavily built.42

No, Diplodocus did not have feathers. It had scaly skin, and some related dinosaurs had narrow, pointed spines on their tails and backs, like an iguana.42

Probably up to about 13 km/h (8 mph), about as fast as a kid running fast. This is an estimate from its size. Diplodocus was very big and heavy, so it moved slowly, like an elephant.2

There is no direct evidence that Diplodocus could swim, but like most large land animals, it probably could wade through water if needed.2

Diplodocus had a long neck to reach high and low vegetation without moving its huge body much. This helped it save energy.2

Yes, large predators like Allosaurus and Ceratosaurus lived at the same time and place as Diplodocus. However, Diplodocus was so huge that it was probably safe from most attacks.42