The Skin modifier has an option to create an Armature on the fly to pose the generated mesh. This Armature can just be useful in cases where you want to modify the position of a part of the generated mesh.
Note that using the generated Armature to pose the base mesh, in our case, is not necessary, and therefore this recipe is treated here only as an example and it won't affect the following recipes in the chapter.
So, let's suppose that we want the arms to be posed more horizontally and widely spread:
Gidiosaurus_base_mesh.blendfile and save it with a different name (something like