If Mr. Krabs can pick up stegos, WHY CANT THEY PICK UP TRIKES!!?!??!?!?!?!?!?!?!?!?!?!?!? Pick things up with this, and tranq them with rifle, u can do it while mounted, or, thing u want to tame in one claw, snake in the other. Boo yah! U are welcome.
I understand that all the previous tips submitted were useful, but just in case it was not clear, hit the TOP OF THE CRAB, it will have a special animation if you hit it in the correct spot, and will take only a small amount of boulders to tame, even a high level. (Irrelevant with Cannons)
If you're carrying a tamed Doedicurus in your claw the Doedic will automatically start harvesting any stones you hover him over. Just start pumping points into your Doedic's weight because it will stop at about half of its own carry weight. I've yet to discover another tame it will work with though...
Be careful when carrying a Dino that has a tribe mate mounted on it. I was walking up a hill carrying my anky with a tribe mate on it and they went under the map and died. RIP ANKY AND SHINEHORN. Tribemate was eh anyway.