One thing to keep in mind with all construction is that this course is always looking back at the same problem of basic construction using forms. Whether it's a table or a house or a car or a dog, we're really just looking at how we can take what we see and break it down into simple forms, that can then have the relationships between them defined in 3D space.

Knowing certain things about an animal's underlying body - like the fact that eye sockets exist - simply gives us one way of looking at how to break down the body. But we don't need to stress over exactly where the eye socket exists relative to the beak on a bird, because we're not concerned with their underlying anatomy. It's just one way we can approach the simplification of the complex structure.

One day you may take a course on actual animal anatomy, but at that point what you'll have learned from here will have been distilled only into the understanding of how the things you draw exist in 3D space, and how they relate to one another within it to create something believably three dimensional.

Long story short - don't get too caught up in what the animal's actual skull looks like. We're just looking for excuses to wedge our forms up against one another.