I started the game to tame one of these guys

But there were almost no spawns, i went to the dead island , waited for days and in that time my base of ravaged by brontos and they killed everything.

I tamed a argy to get a rex easy , it was killed too.

I went to foot of volcano and saw 3 of them together one was perfect, i got my eyes on it , went and prepared.

Came back started tranqing it and then started the race, i was chased by other 2 , almost killed by an alpha Allo and his pack, A carno and a pack of 5 raptors also chased me.

Got the Rex finally, fed it and now i have Xcaliber