👉 Mesosaurs, also known as sauropods, are a group of large, bipedal dinosaurs that lived during the Mesozoic era (about 69 million to 65 million years ago). They were characterized by their long necks, large jaws with four teeth on each side, and a long, powerful tail. The most famous member of this group is the Tyrannosaurus rex, which was known for its massive size and incredible strength. Mesosaurs lived in a variety