A question on familiar binding

Quick question. In what book are Griffin's?

Ah, here is the best I could find on general Magic Animals maturing:

There are some little mentions around the bit I posted above in Hermetic Projects, but really you want to look in Legends of Hermes, p.133-137.

I will accept the correction gracefully, as I may have missed that.
I admit I didn't look at sources beyond RoPM, though I don't view it with the same gravity that I would the ones in RoPM.
Your third point is pretty critical, obviously, and I'm not sure how I missed it.