Ovis are rare to find on the Island, even though they have a large variety of areas they can spawn in. I personally have the best luck in The Southern Islets on the South East side of the map. As soon as you see one, make sure to grab it, as Ovis are very common prey for many of the Ark's predators due to their special meat, Mutton(which is what you will most likely want them for as well).
On Scorched Earth, they are an uncommon spawn in the Oasis areas, normally near the obelisks(I usually have found them near the Red Obelisk)
On Aberration, they are a semi-common spawn within the Fertile Zone, commonly known as the green zone.
On. Extinction, they can be found in the east end of the Tek City, and all over the Snow Proto-Ark
On Genesis 1, they are quite abundant in the Arctic biome
On Genesis 2, very common in the Eden biome
On Ragnarok, they spawn very frequently within the Highlands
On Valguero, look in the upper forest area of the map, just south of the North Eastern snow
On Crystal Isles, they spawn most commonly in the center of the map, with rarer spawns placed in most other biomes
If you wanna get wool without having to get ovis by just geting vegie cake make a cage with dino gate then get a argy to transport it into the cage then just simply shear it with scissors. Up if this is useful
You find them (most often) up in the north biome, at the blue obelisk. As of now, they need to be born on a ceiling (One tile above where you want them), so they will not fall into the water under the map or other unaccessible places, warning, with this method they will still fall through the ceiling, but they will fall onto the foundation underneath, allowing you to claim them there. Another warning, The baby ovis needs to be claimed immediately, or else it will die of starvation, it will also have abnormally low weight, so be sure to feed it very often.