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!!!)
Once I saw a high level spino wandering around and killing everything in sight and when I shot my bow it ran away and I was like what the hell? Killing them isn’t hard just tame a few Dilophosaurs and let them spit poison at the Spino before killing it with your pistols. If you don’t have pistols, get more and higher leveled Dilo and stand back and shoot it with a bow to assist.