In a humid, tropical jungle in southern China aeons ago, a bird-like dinosaur with a toothless beak and dome-shaped crest atop its head became trapped in mud, struggled in vain to escape and died. Workmen blasting bedrock while building a school near the city of Ganzhou unearthed a beautifully preserved fossil of the roughly 6.5-foot-long (2 meter) dinosaur, nicknamed the "Mud Dragon," still in that contorted position.