Tyrannosaurus Rex Returns

This is the skull of a Tyrannosaurus rex at the Carnegie Museum of Natural History in Pittsburgh, Tuesday, Feb. 26, 2008. This T.rex is one of two "battling Tyrannosaurus" that are part of the final phase of the new "Dinosaurs in Their Time" exhibit that will open in June 2008. (AP Photo/Gene J. Puskar) The skull of a Tyrannosaurus rex is hoisted into position by workers, center, at the Carnegie Museum of Natural History in Pittsburgh Tuesday, Feb. 26, 2008. This T.rex is one of two "battling Tyrannosaurus" that are part of the final phase of the Dinosaurs in Their Time exhibit that will open in June 2008. (AP Photo/Gene J. Puskar)
Paul Zawisha, center, works with Bob Ziller to install the scull on a Tyrannosaurus rex skeleton at the Carnegie Museum of Natural History in Pittsburgh Tuesday, Feb. 26, 2008. This Tyrannosaurus rex is one of two "battling Tyrannosaurus" that are part of the final phase of the Dinosaurs in Their Time exhibit that will open in June 2008. (AP Photo/Gene J. Puskar) The skull of a Tyrannosaurus rex is hoisted into position by workers at the Carnegie Museum of Natural History in Pittsburgh Tuesday, Feb. 26, 2008. This T.rex is one of two "battling Tyrannosaurus" that are part of the final phase of the Dinosaurs in Their Time exhibit that will open in June 2008. (AP Photo/Gene J. Puskar) Paul Zawisha, center, works with Bob Ziller, left, to install the scull on a Tyrannosaurus rex skeleton at the Carnegie Museum of Natural History in Pittsburgh Tuesday, Feb. 26, 2008. This T.rex is one of two "battling Tyrannosaurus" that are part of the final phase of the Dinosaurs in Their Time exhibit that will open in June 2008. (AP Photo/Gene J. Puskar)