If we say paper craft, then generally we thing about :
these are definitely the forms of Paper Craft, but at low skill. I have covered some of these in my site. But we focus on 3D hollow model of animal - made from paper. There is very little scope of rework on these models, therefore you have to design and make it correct at one go.
if these models are made of actual size of animal, then it will look real. That’s why many birds look real.
This is a unique hobby. In near future, I will explain how to design the model.