The dinosaur Apatosaurus is also referred to as the 'deceptive lizard'. This dinosaur was named by Othniel Marsh, in 1877. This large dinosaur had a long neck and was quadrupedal or four legged. Apatosaurus was herbivore and its diet comprised mainly of plant life nearer the ground. Apatosaurus is believed to have swallowed stones after every meal. This was done with the intent to actually grind the tough plant food matter it might have consumed! Apatosaurus did not chew its food and hence the need for this peculiar behavior and body need.
Apatosaurus is believed to have been between 70 and 90 feet long and stood at a height between 10 and 15 feet, at the hips. It weighed between 33 and 38 tons! Apatosaurus lived in the late Jurassic period, dating back nearly 157 million years ago. Fossils of Apatosaurus have been discovered in Colorado, Oklahoma and Utah and in North America. The lizard hipped dinosaurs had tails that swished about like whips and they were peg toothed. Another feature that distinguishes them from other dinosaurs is the high spines on the vertebrae.

Apatosaurus belonged to the family 'Diplodocidae' and super family 'Neosauropoda'. This dinosaur had nostrils on the top of its head.