So a griffin egg will have a mark on them. It will be orange or yellow,but the thing you need to worry about is the shape of the mark. If it is a star it's a boy. If it is in the shape of a heart it's a girl. When a female griffin hatches she will most likely have blue eyes or white spots. A boy does not have any markings.
I think that's all you need to know for now. Tell me if I missed something and I will add it!
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How to raise your griffin
FantasyThis book tells you how to Raise a griffin properly! It has everything you need to know. (This is sort of a roleplay)