So what you wanna do is kill a male or something and then get its pheromone and put it in like a big dinosaur and then a female Rhyniognatha will lay a egg inside that dino with the pheromone and the baby will burst out of the dino (and yeah ur dino is dead you no longer have it) and you have to raise and take care of the baby Rhyniognatha. I hope this helped.

-TherizinosaurusGurl