Probably the most underrated Dino in the game! They can actually harvest a massive amount of metal, crystal, stone, flint, and obsidian. In Ragnorok there is a ravine by the volcano in the highlands underwater, One run in this ravine will give u 10,000 metal ingots and well over 10,000 obsidian from the same dark gray rock.
One oil run with my newly tamed 198 dunky allowed me to make enough gasoline to last me my entire single player play-through. I probably have about 8,000-10,000 total now. A must-have for all your gasoline needs.