The Ochotonidae are represented at the present day only by the single genus Ochotona (Lagomys), which includes all the picas, or mouse-hares.
Titanomys is the earliest form, from the Middle Miocene, succeeded by Lagopsis, and then by the modern Ochotona.
Typical mountain steppe mammals include Altai pika Ochotona alpina, arctic ground squirrel Citellus undulatus and Siberian chipmunk Tamias sibiricus.
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