One mammal group that survived the end-Cretaceous mass extinction but died out during Oligocene is called

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Multituberculates were a diverse group of rodent-like mammals that survived the end-Cretaceous mass extinction. However, they gradually declined and went extinct during the Oligocene, possibly due to competition with rodents. Lagomorphs (rabbits and hares), creodonts, and pantodonts all diversified or appeared after the end-Cretaceous mass extinction and did not go extinct until later geological periods.

One Mammal Group That Survived the End-Cretaceous Mass Extinction but Died