The taxonomic position of the Lagomorpha (pikas and rabbits) with respect to the other mammalian orders has been vigorously debated over the past century. Lagomorphs were traditionally United with rodents in the cohort Glirus; however, such groups as primates, insectivorans, and artiodactyls have also been considered the sister group of the lagomorphs. And new fossil evidence support a sister group relationship between rodents and lagomorphs, a monophyletic group.

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