Once you have have a high level one, they make a great taming aid: you can fire tranq darts while riding this mount, and it'll tank all the damage. I once put out 6 member pack of raptors while riding this animal.same with the first Rex I tamed.
1. Get tranq arrows and a crossbow
2. Find an anky of your desire
3. Shoot it in the head while walking backwards (they're slow so you can just walk while shooting)
4. When it runs away chase after it and shoot it
5. It'll be knocked out.
6. Feed it recommend food and any narcos if needed.
They get about 3x more metal than you! And depending on the level they can easily kill Raptors and other small predators.
They're found almost everywhere
Beaches, highlands, chalk hills, green forest, I've even see some near desert.