Don't think I didn't agonize over this one! I have the impression that we actually know
Protoceratops lived in deserts, and nested in colonies. I thought about that and I just didn't want to take that approach, so here we have them living as a solitary couple hidden in a nook someplace. I just couldn't not picture some big predator
showing up and just chomping 'em up otherwise! Walking with Dinosaurs
made a pretty convincing depiction of Protoceratops as these aggressive snapping creatures, but that also wasn't really conducive to the theme I wanted either, so--well, I just want you to know I considered it and in the end this is what I wanted to draw.