to all brokie/newbie that want one rhyniognatha but don't have materials for craving or a good dino here's what u need to do:

firstly get a bronto. ask my why well cuz it's the easiest tame that could stand a chance against a low level rhynio

secondly get a bronto saddle or platform saddle if u want to keep ur bronto later on

thirdly level ur bronto to minimum lvl 40 max NA by mass gathering berries(note that rhynio saddle unlocks at lvl 90 so while ur leveling up ur bronto use the nacroberry ur bronto collect to make some narcotic with rotten meat) and level all their stats in damage and health

fourthly kill a LOW lvl male rhynio for pheromone

lastly get the pheromone and the creature ur gonna sacrifice(if u got ur bronto a platform saddle then get a trike on the platform saddle) and walk up to a female rhynio, battle it until its has less then 10% health then quickly go ride ur sacrifice dino and feed it the pheromone the female will then impregnate ur dino and fly away and whola u got urself an rhynio(btw if u wanna lvl it up quickly, get a saddle and find explorer notes as long as u discover the explorer note while riding ur rhynio it will give the exp to ur rhynio instead of u)