So apparently everyone here freaks out about how hard it is to tame them and they're like you need a megalosaur and blah blah blah. No. Actually I reccomend that you have a few bolas and a crossbow. Find a pack and unless you intend to tame them all use the crossbow to kill the ones you dont want from a ledge. Then bola the ones intended to be tamed and knockout. I reccomend only ever taming one at a time unless you have a trap. For each ravager you'll never need more than 25 tranq arrows on a primitive crossbow. Taming food is easy. Just kill a nearby ovis. Hope this helps.
Hey just thought of a small trap that a midrange level person could make you have a one by one of stone but instead of walls you have doorframes and one side is double doors thats how you get them in and out and you have a bear trap in the middle you trap it then run over and shut the double doors (i dont know if this is new or can help someone but if it can that would make my day.)
These guys are stupid easy to tame on Crystal Isles. Pick it up with an Argee and yeet it into a taming pen. Knock it out however you prefer and give it some mutton. Bada bing, bada boom, Bob's your uncle.