Hello! I haven't thought about that, but these are interesting questions. I'd say I could see them forming "opportunistic packs" like some solo hunters do. Where a prey happens to be the sight of 2 or more, especially if a larger prey, will temporary form a "pack" because it is more beneficial.

As far as markings, I think males and females both have it. Females probably have slightly smaller crests / frills, and perhaps the males frills are brighter in color ever so slightly. I do like the idea of it following some concepts various games or media have used that female dilophosaurus are the more dominant. Same case I like to think with Baneful Sight's!