As continued in modern male birds having the more extravagant displays.
Part of the evidence for dinosaurs being birds is that female dinosaur bones show the same changes that female birds during their reproductive cycle - they build up like extra blood structures for support iirc.
Usually weird protrusions on dinosaurs have to do with sexual distinction, rather then function.
Even the horns and neck shield on the triceratops are more about sex than about offense/defense
As continued in modern male birds having the more extravagant displays.
Part of the evidence for dinosaurs being birds is that female dinosaur bones show the same changes that female birds during their reproductive cycle - they build up like extra blood structures for support iirc.