 Of these , zoologists Colin Groves and Peter Grubb identify O. o. hastata , O. o. montana , O. o. ourebi and O. o. quadriscopa as independent species in their 2011 publication Ungulate Taxonomy . 
 Of these , zoologists Colin Groves and Peter Grubb identify O. o. hastata , O. o. montana , O. o. ourebi and O. o. quadriscopa as independent species in their 2011 publication Ungulate Taxonomy . 
Of dem , zoologists Colin Groves and Peter Grubb identify O. o. hastata , O. o. montana , O. o. ourebi and O. o. quadriscopa as independent species in their 2011 publication Ungulate Taxonomy .