If you have a Snow Owl and two people, make sure not to aggro it, and have one person freeze it and while it's frozen have the other person quickly build either high stone walls or two wood walls stacked on top of each other around it. You can use fence foundations to put the walls on top of and can put a wooden door frame on top of a wall on one of the sides so you have a place to jump and shoot at it from.
They might be useless for some YouTubers. But these things are literally the FASTEST thing in the game. They are even better on multiplayer. They can carry loads of ppl to quickly enter the battlefield when you are raiding them and the Dino gate is exploded. One person drives the Gallimimus and the other two shoots with the assault rifle. Totally op