Valerius Geist reports on how mountain sheep are more readily tamed by humans than other wild animals.
Valerius Geist, Mountain Sheep: A Study in Behavior and Evolution (Chicago: University of Chicago Press, 1971), 41
WORKING WITH TAME MOUNTAIN SHEEP
It is hard to imagine a wild animal more readily tamed than mountain sheep. They habituate readily to man if not hunted and will accept him as a two-legged salt lick if he so wishes. Sheep will habituate to a person if they see him daily and within a few months allow him to approach closely. A close association between the investigator and his study animals is, during at least part of the study, a most desirable situation, as it allows him to gain insights unobtainable in any other way.