Location : Northern Argentina

Pisanosaurus is the earliest known herbivorous (plant eating) dinosaur. It was very small compared to the later giant plant eaters. Not a lot is known about this small dinosaur. Pisanosaurus, being such an early dinosaur, did not look very different from early meat-eaters - in fact, they may have all been related! It wasn't until later in the Triassic period that plant eaters got bigger and began to walk on four legs instead of two.

Not much is known of Pisanosaurus. It is known only from a fragmentary skeleton. It was initially classified as a heterodontosaurid. It had closely packed teeth that eventually evolved into the large batteries of teeth found in later herbivores. It most likely fed on low growing ground cover. It is thought that it would not have utilized gastroliths and probably avoided tougher plants.