Psittacosaurus Bone size: about 20cm This red-colored hand fossil of the Psittacosaurus, found in northeastern China, dates back to the Early Cretaceous period, approximately 120 million years ago. The specimen is exceptionally well-preserved, with the skeletal structure of the hand clearly visible, especially the shape of the phalanges, which showcases the typical characteristics of a reptilian limb. Psittacosaurus was a small herbivorous dinosaur, and the structure of its hands suggests that it may have used its forelimbs to grasp plants or potentially assist in feeding. The fossil surface exhibits a unique red color, likely due to mineral deposits, which makes it particularly striking. This fossil highlights the distinct functionality of the Psittacosaurus’s forelimbs. Although this dinosaur primarily walked on two legs, the details of its hand offer valuable insights into its ecological behavior. The red appearance of the fossil sets it apart from other similar specimens, offering important clues about the species' diversity and adaptability. This hand fossil not only holds significant academic value for paleontological research but also provides precious evidence to further understand the lifestyle of dinosaurs.