They only fit through metal dino Gates none of the other kinds tho, if you find a lvl 280 and tame it and a few other high lvls you will make a wild giga rage if you do the charge attack very helpful if you have a wild giga near your base and you want to kill it
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.
The wooly rhino is a great tame I got a 150 perfect tame and just used it in a raid and it took down 3 Rex's and with the help of another rhino we took down a giga really recommend this dino
Get a male and a female rhino breed them until you get around 500+ melee damage, with 100% imprint it almost always rages gigas with one full charged attack.