关键词: 高原鼠兔, 达乌尔鼠兔, 摄食行为, 栖息地

Abstract: Studies of foraging behavior for 0.curzoniae, 0.daurica and of their behavioral adaptation to their habitats were carried out by direct observation of marked pikas of free living individuals at Niannuosoma area of Oangcha county，Qinghai province．Both plkas exhibit the same time rank of behavioral patterns of foraging behavioral Chain
:feed> defence> locomotion．Time of spending defence by 0.curzoniaewas more than of 0.daurica ，however time of 0.daurica spending forage was m ore than that of0.curzoniae．
0.curzoniaecut htgh plants in its microhabitat in order to keep the open field of vi—Sion for defence enemy，and 0.dautica made use of the high plants in m icrohabitat for hidden itself when it met with a predator. The resuIts showed that two species of pikas provided behavior flexibility to adapt their habitats，habitat selection of the Pikas were enhanced by predation risk.

Key words: Ochotona curzoniae, o.daurica, Foraging behavior Habitat