Two fossilized dinosaurs discovered in China are believed to be the oldest ancestors of the Tyrannosaurus rex family. The adult and juvenile specimen at 9ft. and 6 ft. tall respectively are much smaller than the T. Rex which had a height of 15 ft. For more on the discovery, visit LiveScience(1), or click here(2) to view an artist's rendition by Zhongda Zhang/IVPP.

1. http://www.livescience.com/animalworld/060208_old_dino.html
2. http://www.livescience.com/php/multimedia/imagedisplay/img_display.php?pic=060208_trex_dad_02.jpg&cap=An+artist%92s+rendition+of+Guanlong+wucaii%2C+the+oldest+known+tyrannosaur.+Credit%3A+Zhongda+Zhang%2FIVPP