Trackways, the multiple fossilized footprints of dinosaurs, have given paleontologists some idea of the feeding habits of many dinosaurs. For example, an Early Cretaceous period site in Texas, as well as a Late Cretaceous period one in Bolivia, show footprints of what appears to be a pack of theropods actively stalking a herd of sauropods. In a Cretaceous period site in Australia, fossilized tracks suggest a herd of over 100 small coelurosaurs and ornithopods stampeded as a large, single theropod stalked the group. In a Utah coal mine, Cretaceous period footprints of herbivorous dinosaurs cluster around fossil tree trunks, giving some indication of their foraging behavior.