Paleontologists Paul Sereno (R) from Chicago University and his colleagues Ricardo Martinez and Oscar Alcocer (L) from the Universidad de San Juan, show a replica of skull of a carnivorous dinosaur discovered in Canadon Amarillo, in the Argentine province of Mendoza, September 29, 2008. The palaeontologists said the specimen was part of the evolutionary change from carnivorous dinosaurs to birds and measured six or seven meters in length by three or four high, walked on two legs, like the Tyrannosaurus Rex, but much smaller. REUTERS/Paulo Paez (ARGENTINA)