Didelphodon was a small, primitive badger-sized metatherian mammal that lived during the Late Cretaceous Period, around 73 to 66 million years ago. It was found in the Hell Creek Formation of Montana, the Lance Formation of Wyoming, the Frenchman Formation of Saskatchewan, the Horseshoe Canyon Formation of Alberta and the Scollard Formation of Alberta. Weighing 10 Kilograms, it was one of the larger mesozoic mammals. Despite common belief, Didelphodon was not similar to modern day badgers. Instead, it likely had a body similar to an otter and a head similar to that of a tasmanian devil. It is also believed to have been semiaquatic and to have feeded on molluscs. Didelphodon died out around 66 MYA at the same time as the non- avian- dinosaurs due to the KT- extinction event.