How to easily tame one for early access to end-game transportation:

Things needed: spyglass, tamed trike, trike saddle, sword, simple pistol, at least 50 simple bullets

Recommended player level: level 35

1. Tame any trike then after its tamed ride it and destroy trees or kill creatures until it gains enough exp that you can pump several to a dozen levels in health into it.

2. Go to the swamp and find a rhynio, then target it with the spyglass to check if it's male or female and what level it is, obviously don't get close enough that it starts chasing you.

3. Assuming the rhynio is low level and male then you are set to kill it, but if it is too high of a level to kill or female then find a new one. Many tips will say just to kill it but never actually explain how to before it can kill you, so here's an actual good way to kill it:

4. Equip the sword and simple pistol in your hotbar, mount your trike then find the rhynio, aggro the rhynio using the pistol and magdump it until the rhynio gets close enough and starts attacking your trike, then equip your sword and start swinging at its face as much as you can until it dies while your trike tanks the damage. If it starts shooting resin at you then switch to your pistol and start shooting at it (This requires quick and precise aim as the rhynio can move from spots quickly while it is shooting resin). After it dies open its inventory and take its rhyniognatha pheromone.

5. After you take the pheromone, you can wait for your trike to heal while watching the spoil timer of the rhynio pheromone then find a low level female rhynio, feed the pheromone to the trike if it hasnt spoiled yet, then do the same attack process described in step 4 but don't damage it so much that it dies, you can then wait for the rhynio to impregnate your trike then it will fly away.

6. You can choose to satisfy the trike's cravings or not, but since this is a beginners' tip it wouldn't matter if you did or not. Put a lot of berries in the trike's inventory, then you can just wait until the gestation timer finishes and your trike dies.

7. After your trike dies and your juvenile level 1 rhynio pops out and lands somewhere near where your trike was, put enough raw meat in it's inventory for it to last until it becomes an adult and you can imprint it if you want the damage and resistance buffs.

8. You now have a tamed rhynio, end of tip.

9. Just kidding, while you wait for your rhynio to mature you can grind explorer notes until you get to level 91, (takes around 20 on singleplayer) and since the rhynio's maturity timer takes so long you might even be able to craft the saddle before it reaches adulthood.

10. When your rhynio reaches adulthood you now have a flyer that is faster than a quetzal, has more weight than a quetzal, can pick up almost all land creatures in the game, and cannot be attacked by most aggressive creatures unless you attack them first.

Note that since you have a level 1 rhynio you should avoid fighting other rhynios, as it can easily be killed if 2 or more rhynios attack you at once