If you are on a pvp server(pve works as well), and you're raiding someone, try to use the rhino's charge attack. If your opponent has a rex, and you hit it with a full charge meter, it will be an instakill.
Great ambush mount for pvp. Come to someone's base while their not there and charge their dinos it's overpowered I've one shotted alpha rexes with a lvl 80 rhino