The Apatosaurus lived presumably during the late Jurassicperiod, 150 million years ago.
The body length of the animal reached around 20 meters (65.6 ft), its weight was 30 tonnes. Despite the dinosaur’s immense dimensions its skull was only about 50 cm (19.7 in) in length. The Apatosaurus was a peaceful herbivore; it needed to feed on plants most of the day to obtain sufficient energy for survival.
The Apatosaurus used its long, powerful tail and the claws on its front feet for defense. The animal was probably capable of standing on its hind legs for a short period of time.