As random as what the Queen eats. And she tries anything she gets.
I was just a little put off by the fact every chimera now speaks and even has a fairly high intellect... at least Turtle and Pinguin.
That's extremely fast considering the first talking chimera was our little brother and sister chimera and their mother did not die from exhaustion yet. So we're talking about 2 weeks? 5 weeks? Way too fast to my liking.
But I guess this is part of that arc setting, so that chimeras can adapt very quickly to first fire arms and army, then nen users... with the Ponzu group giving nice genes and powers, etc.