Machairasaurus whole refers to the sabre-like claws of the hand. The holotype, IVPP V15979, was found in layers of the Bayan Mandahu dating from the late Campanian. It mainly consists of a left frontlimb, including the lower end of the lower arm, two carpal bones and a complete hand. Also some fragmentary foot elements were present. The other find is the paratype, IVPP V15980, consisting of a very fragmentary skeleton including tail vertebrae, chevrons, ribs, phalanges of the hands, fragments of the second and fourth metatarsals and pedal phalanges. Five oviraptorid specimens associated with a nest, the female having been found
Roll the Bones rated it as one of the band's best ever songs partly due to its different texture than the rest of the album. The band was optimistic about its musical form, but faced the problem of overworking its arrangement because all the parts sounded good to them. In the end, they learned that by stripping the song back resulted in a stronger track. "Roll the Bones" was named after a science fiction story by Fritz Lieber that Peart had read some fifteen years prior titled "Gonna Roll the Bones". Though the story had no influence on the music or its message,