Pachycephalosauridae

My biggest drawing yet! Took about a day or so

I've always quite been fascinated abt Pachycephalosaurids. There has been some debate n all going on abt things like whether Dracorex n Stigy are separate species, but this is not that.

What I'm asking is, we all know Pachy is the largest of the family. But who's the next largest?

O' wise members of Dinopedia, share thy wisdom

F

Firstly, why?