Edmontosaurus (name meaning "Edmonton lizard") is a genus of saurolophine hadrosaurid dinosaur that lived in North America during the Late Cretaceous period.
A herd of Edmontosaurus is seen being stalked by the pack of Alaskan Troodon. When night falls, the Troodon attacks the herd, separating one of the juveniles from its mother, before attacking it from all sides. An adult Edmontosaurus comes in to rescue it and drives away the theropods, killing one of the Troodon in the process. Unfortunately, by morning, the juvenile Edmontosaurus has died from its injuries, and the herd moves on while the Troodon begin to feast on it.
- A 2015 study refer to the Edmontosaurus that appear in this episode as a new genus Ugrunaaluk. However, a 2017 study from Hai Xing and colleagues, regard it as a nomen dubium indistinguishable from Edmontosaurus. Ugrunaaluk has since been synonymized with Edmontosaurus.
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