Population Pyramids - day 2

We were talking about the different types of population pyramids, and the females are always on the right for any type of pyramid.  The females are on the right for the Christmas tree pyramid, the box pyramid, and the cup pyramid.  Every once in a while, the males will be on the right.  The box pyramid is not always almost a perfect rectangle, it usually bulges around the middle of the graph.  A Christmas tree pyramid is not always a perfect triangle, but can look a little morphed.  The cup pyramid does not always look like a cup, but it can look more like a vase.