I am building a house on the Island, and this massive creature has been very helpful towards building, you can build while riding and flying, like on an argy but you can move backwards/move around a lot easier, for me anyway, I do suggest trying them out for building, gives them a new use really-

High levels can be great for carrying Dino’s who run/attack back

The amount of HP And Weight cap is insane for picking up lots of useful Dino’s, it’s great as a carrier as well

Take a rex, for example. Rex are dangerous and you are broke on materials to make a trap but you have a high-level rhynio, use the rhynio (yes it can pick up rexes it’s cool) and pick it up, have your tribe mate go ahead and tranq it out while the rhynio goes ahead and tanks damage (with resin armor it takes 20-40 damage)

Rhynio can also stun/encase creatures with Amber with the sniper mode (RB + LT on xbox) or the grenade launcher mode, you will see a sort of bar on top of the creature and the more you hit it, the more icons get colored with an Amber color, once it turns full and red, the creature is now stuck and has basically to no movement speed, making tames like Gallimimus easy

The Taunt attack (Hold R3 or Right Thumbstick) will do the reduced version of the fear roar from the yuty, making an blue/teal aura around Dino’s

I learnt this from experience, and I will sea you layter

~ CPG

You can fire from its back to tame pretty much any creature and it is remarkably easy to control when you are riding and weilding a weapon. Any dino that is too hard to hit while shooting from this thing's back can be picked up and put into a taming pen or frozen with resign thus making this the ultamate taming mount. If you get off of it and whistle for it to follow you it won't land and you can sit in its passenger seat. This allows it to regen stamina whist in the air. It is the only flyer you can do this with without anything to keep you in the air. There is a glitch that can occour that causes the player to exit tames in third person. This can happen when you land on any vertical surface whilst in third person. It can be reversed by landing on any vertical surface again but this time in first person. These guys have one weakness. If a megatherium kills just one other bug with the bug buff already active a wild level 12 can deal 826 damage while your level 66 rhynio will only deal 44.

RIP. Vjordic

Although you can't breed them you can still get the color mutations like any other tame. Trap a few rhynios and reuse them until you get the colors you want.

It can pick up 2 medium sized dinosaurs such as rex's and plesio's can attack several enemies at once with all 6 of it's legs and it's head also it can continue holding the dinosaurs while swimming and flying which leads me to suspect that it is the size of a quetzal or as big maybe even bigger than a wyvern it will also cause bleeding and can pick up 2 enemies as well as attacking and pushing several enemies it's wings have a specific pattern representing the eyes of a tusoteuthis which makes it so that you are not attacked while underwater and while sprinting it can not be grabbed by a tusoteuthis.

Description: A very resilient and loyal creature when attacking your target, but difficult to manage due to its size. It has limited stamina that drains quickly, which is inconvenient during combat while utilizing its expert flyer abilities, forcing the creature to land abruptly and take enemy attacks.Tip: When riding with a saddle, never dismount while flying high up in the air because it will be difficult to recover once you fall to the ground.

I know for a fact that they can pick up structures on Ark mobile you just have to turn on resin armor toggle third person so you can look through the players eyes towards the structure you wanna pick up and then use the pickup function the rhynio has and you will lift the structure putting it down somewhere is can be a bit wonky but at least it works