Lumbering along at the pace of a stoned diplodocus comes Dinosaur 13, a documentary about a team of South Dakota paleontologists who found and extracted a beautifully preserved T-rex, only to have it snatched from them by the US government. Before 1990, only 12 Tyrannosaurus rex skeletons had been uncovered. Then up popped "Sue", the largest and most complete fossil skeleton of her species found to date. Named after the woman who found her, and dug up and preserved by paleontologist Pete Larson, Sue quickly became a celebrity in the nearby town of Hill City (population: 535).

The people wanted to use her as a beacon for their community. But the dinosaur had been found on federal land, so the FBI swooped, Sue was taken and Larson began a 10-year legal challenge, dubbed "the biggest custody battle in history", which ultimately saw him do 18 months in jail. For a story of passion (at least five contributors tear up on camera), Todd Douglas Miller's film feels oddly dry. Perhaps the problem is the subject. Sue's the quiet sort and a legal battle over a fossil, however monumental, is hard for the outsider to care about. This is a bare-bones documentary, lacking in roar.