The rhinorax beast are native to, and are only found, on the island of Vulta-Nui -an island that is almost always subject to rain and lightning storms.
Their hard exterior is stronger than most armors, and protects them whist they're charging through tight areas like the thick jungles of Vulta-Nui without being harmed.
Their long blade-like claws and enormous horn make for deadly natural weapons.
They are more of a loner-species, and often times they even attack their own kinds when spotted. They're violent creatures that attack -and kill- anything that moves.
Their diets consist of jungle-rahi, and sometimes even their own kind if they're hungry enough.
The only creatures on Vulta-Nui that stand a chance against fighting the rhinorax beast are the vorgurin. Coincidentally, the vorgurin are the rhinorax beast' favorite food, and have nearly caused the species to go extincted.
The rhinorax beast are the single reason that Vutla-Nui is uninhabited by matoran, and luckily the rhinorax beast can not swim, so they will not spread population into other islands.
It is thought insane to hunt the rhinorax beast, and only few have ever done so.
One very successful rhinorax beast' hunter is a matoran named Viiloru. He lives in the jungle by himself on Vulta-Nui, and is aided in his rhinorax beast' hunts by a vorgurin war-beast.
Quoting Del Skirata (A-84)
Cool! And uh, when are you judging for the matoran contest?
I made the mistake of setting a date. There wasn't meant to be one until I have enough members to even start one.
Right now I'm just waiting for a lot of people to join and add their matorons so I know the group is worth it.