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Cody asks: "Did you give your dinosaurs facial expressions?"

Answer: Yes, I tried that idea in Dinotopia: Journey to Chandara. I suspect dinosaurs didn't have very mobile faces, so instead of having them gurning, I did what I could with the tongue and the eyes. 

Realistically, I assume dinosaur expressions would resemble those of birds, with most of the signaling carried by hackled feathers, eye dilation or "pinning," and body posture. 

There's always a temptation to anthropomorphize dinosaurs, but I find it more interesting to make their expression of emotions appear more exotic and strange.