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Palaeontologists disagree over whether tyrannosaurs such as Albertosaurus hunted in packs. Dr Phil Currie of the Royal Tyrell Museum of Palaeontology, Dr Angela Milner of the Natural History Museum and Dr Matthew Carrano of the State University of New York give their opinions. This programme was originally shown in 2000. The fossils described in the clip have since been definitively identified as Albertosaurus.