We have been collecting dinosaurs in many locations in the United States, with a very large focus on our site in South Dakota. We have been collecting at this site since 1995. We mostly find the bones of the late Cretaceous dinosaur Edmontosaurus annectens. This site is a treasure of Cretaceous bones from the end of the dinosaur era. We believe this area was the remains of several events that happened during this period, resulting in the death and very quick burial of these animals. In this site, we find adult bones right next to the bones of sub-adult and juvenile dinosaurs.