Barosaurus (BARR-oh-SAWR-us) meaning 'heavy lizard' (Greek barys/βαρυς meaning 'heavy' and saurus/σαυρος meaning 'lizard', referring to its heavy neck bones) was a giant, long-tailed, long-necked, plant-eating dinosaur closely related to the more familiar Diplodocus. Remains have been found in the Morrison Formation from the Upper Jurassic Period, along with five other sauropods: Diplodocus, Apatosaurus, Camarasaurus,… (More on Barosaurus)