<human>:  What is the name of the dinosaur that is the most famous fossil found at the Dinosaur National Monument?
<bot>: The most famous fossil found there is the Apatosaurus. It was discovered in 1877 by Edward Drinker Cope. The name Apatosaurus means "deceptive lizard" in Greek. It is a large bipedal herbivore that lived during the late Jurassic period. It had a long neck and a small head.