English: It has long been assumed that dinosaurs probably laid hard-shelled eggs, but the discovery of Qianlong has challenged this idea. Qianlong is a basal sauropodomorph dinosaur from the Early Jurassic of China, known from three adult specimens and five clutches of elliptical eggs. These eggs appear to have been leathery and flexible in structure, and they represent the oldest leathery eggs currently known. The preserved embryos suggest that in Qianlong juveniles, the skull and arms are proportionally larger than the adults, implying that Qianlong was bipedal as an adult, but likely quadrupedal as a young juvenile.