FILE - In this April 15, 2014 file photo, a cast of a Tyrannosaurus rex discovered in Montana greets visitors as they enter the Smithsonian Museum of Natural History in Washington.
FILE - In this April 15, 2014 file photo, a cast of a Tyrannosaurus rex discovered in Montana greets visitors as they enter the Smithsonian Museum of Natural History in Washington. J. Scott Applewhite AP
FILE - In this April 15, 2014 file photo, a cast of a Tyrannosaurus rex discovered in Montana greets visitors as they enter the Smithsonian Museum of Natural History in Washington. J. Scott Applewhite AP