Chemical fossils are compounds of organic origin formed by living creatures found in rocks. Usually no trace of the organism remains. Large organic molecules do not survive long after an organism dies, but these molecules can break down into smaller, stable molecules, which can survive for a long (virtual) geological period. Chemical fossils are probably the most important in their use as the first evidence of life. Bone fossils can tell us a lot about a dinosaur's external and internal anatomy. For example, where muscle attaches to bone, it leaves marks that can indicate the size, shape, and functions of various organs (K). Additionally, cavities and skulls can give us an idea of ​​their intelligence, behavior and main characteristics. Some fossils can also tell us about growth, injury, disease, form, function, activities, and instincts (K). In addition to fossil bones, trace fossils can provide us with information about dinosaurs. We can learn the speed and strength of strides, whether we walk on two or four legs, as well as the bone structure of the foot (Col). Additionally, we can learn about stalking behavior and the existence of dinosaur herds and