x1 is a pika (member of lagomorph genus Ochotona) of subtaxon/type/species/variety/breed x2
Meant for the genus of pikas Ochotona. Appropriately used, cannot include: rodents, shrews, elephant shrews; related to rabbits. The family Ochotonidai is presently known as monopyhletic. See also: oxtonidai, ractu.