Alaskan Troodon was first seen when one was drinking water by a herd of Edmontosaurus. At nightfall, a gang of three Troodon attacked the hadrosaurids, a young Edmontosaurus was separated from the herd. The Troodon caught it, and almost killed it before the parent arrived, killing one Troodon by crashing into it and knocking it away. The rest of the Troodon fled. The next morning, the young Edmontosaurus was seen lying dead on the ground.