<prompt> Passage: The zvipenyu squirrels vanokamurwa subfamilies shanu, pamwe vanenge 58 genera uye vamwe 285 marudzi. The chete chisvava rekare zvisaririra, Hesperopetes, rinodzokera Chadronian mukupera Eocene, anenge 40-35 mamiriyoni emakore akapfuura uye akafanana ano kubhururuka squirrels. A siyana zvisaririra squirrels, kubva ichangobva Eocene kuti Miocene, havana kupiwa nechokwadi kuti chero mupenyu dzinza. Zvichida vamwe ava vaiva dzomutauro wekare protos mupfungwa yokuti vakanga vasina zvizere siyana zvipenyu squirrels autapes. Kupararira uye siyana akare uye vakararama madzitateguru squirrels akadai squirrels angave akatanga muNorth America.  <response>: shanu 