The colors are material colors. The file consists of one object. The skeleton consists of 16 joints. It covers the entire mesh. The head can be rotated or extended using joints to convey certain emotions. The joints and materials have meaningful names.
The rig will only work with file formats that can store joint data: .fbx (Autodesk, supported by most 3D programs) .c4d (Cinema 4D) .dae (COLLADA)
The following file formats are also available, but they wont include correct materials (due to file format limitations): .3ds (3D Studio) .obj (generic format supported by most 3D programs) .dxf (AutoCAD) .stl (stereolithography CAD)
The last picture is a demonstration of the rig, the pose itself is not included.
Similar drones and robots are available under my name.