>>> Birds get away with flying around with all kinds of strange
>>> display structures that would weigh more than a light covering
>>> of scales would.
>>
>> Some might argue that that is what birds can afford to do, after
>> they first got good at flying around.
>>
>> You can put carpets and chairs in modern planes (even small
>> ones), but the Wright Flier had to watch how much material it
>> took on board.
>
> But birds didn't lose their teeth when they started to fly. They
> lost them later, and several times independently.
Aside from perhaps _Incis[ivo]saurus_, what maniraptors used their
teeth as display structures?