When they start to chase you don’t worry. You can easily outrun them even with a few to no speed level ups. Only takes a few tranq arrows and narcotic. If you don’t think you can survive the threats of the north there is a island in the bottom right corner of the map where they can be found.
First, pick one up with a flying dino to bring it away from its herd. Then you can just keep shooting at it while walking backwards, they’re really slow so as long as you keep your distance you should be fine.
Keep shooting at its head with tranqs, it shouldn’t take too many arrows/bullets to knock it, but for my level 100 it took about 40 arrows with a compound bow.