Ive seen a lot of these suckers by the southern plains. Also, Ive noticed that if you are escaping one, try to find some fish. It will become distracted by the fish allowing you to escape. Hope this helps!
If you are having a hard time finding spino's in their respective spawn zones (especially Ragnarok), kill all the fish in that area. They share the same spawn capacity and can be out spawned by coles! ( up vote so Rag players know!!!)