Amargasaurus

Amargasaurus is a genus of sauropod dinosaur that lived during the Early Cretaceous Period, about 130-125 million years ago. It was a medium to large-sized herbivore, with an estimated length of about 26-33 feet and a weight of about 2-3 tons. Amargasaurus had a long, slender neck and a small head with a beak and small, peg-like teeth. It also had a unique, double row of long, slender spines running along its back, which may have been used for display or to support a fleshy crest. Its body was probably covered in a layer of tough, scaly skin.

Amargasaurus was discovered in Argentina in the 1980s, and was named by paleontologists in 1991. It is considered a relatively primitive sauropod, and is thought to be closely related to other early sauropods such as Barapasaurus and Euhelopus. Amargasaurus is known from a number of well-preserved fossil specimens, including several partial skeletons and skulls, which have helped paleontologists learn more about the anatomy and behavior of this dinosaur.