For the past few days ive been searching for one. I decided to move one and i went to the cave of the massive to get the artifact. My argy gets tired so we land a little inland going to the oblisk and i find an ovis! IF YOUR HAVING TROUBLE SEARCHING FOR SHEEP IN THE NORTH THERE ARE SPOTS IN THE SOUTH. Check on ark wiki for details
The frist time I saw mine, I was on the edge of the redwood forest near a small stream. I picked it up with my Argent, so if you want to take it home and save it for breeding or tame meat that's the way too go.