Fauna of Saskatchewan that lived in herds; Limnenetes anceps or a cud chewing plant eating sheep sized hippopotamus; "Hendryomeryx esulcatus", "Leptomeryx" "speciosus" and "L. mammifer" or small hornless ruminant; "Didelphodus serus" or meat eating marsupial about the size of a Virginia opossum or house cat; "Thylacaelurus campester"; "Wallia scalopidens" is a fossilised proscalopid insectivore bat; Auxontodon processus; Microparamys solidus The Cretaceous–Paleogene boundary marks the Cretaceous–Paleogene extinction event which saw the extinction of many of these prehistoric animals which remain only as fossil remnants. Mammal species differ between the various ecoregions of Saskatchewan. Members of six orders of placental mammals which inhabit Saskatchewan. They
Chewing Ornithopods, a group of dinosaurs including the Hadrosaurids ("duck-bills"), developed teeth analogous to mammalian molars and incisors during the Cretaceous period; this advanced, cow-like dentition allowed the creatures to obtain more nutrients from the tough plant life. This may have given them the advantage needed to usurp the formidable sauropods, who depended on gastroliths for grinding food, from their ecological niches. They eventually became some of the most successful animals on the planet until the Cretaceous–Paleogene extinction event wiped them out. The process of chewing has, by analogy, been applied to machinery. The U.S. Forest Service uses a machine called