what might the shape of the skull and the supraorbital height tell us about each species?

The shape of the skull and the supraorbital height tells us about each species are the following:
-It gives us hints and evidences about which evolution stage the specie evolved.
-It gives us hints and evidences about the characteristics of the specie. Each specie on a particular evolution stage has different characteristics and attributes. 

Digestion because it removes waste