Tyrannosaurs catch a lot of teasing for their tiny arms. The fiddly, two-clawed appendages just look a little silly on carnivores of such imposing stature. But they were hardly alone—another enigmatic ...

Along a roadside in Anhui province, eastern China, cannonball-sized fossils recently caught the attention of paleontologists passing through the Qianshan Basin. Believed at first to be typical ...