This model can import to Blender.
Before purchasing this model, you can [Black Rat](https://sketchfab.com/3d-models/black-rat-free-download-3db3acb4140d4de8bd62a171212bad9c) and try to import it.
The UV in the FBX is totally wrong. The model becomes useless if you don’t have blender.
The alpha is used feather’s png alpha channel.
and it is 2 UV channel for the feather.
The feather - Color :
uv1_golden eagle_color.png “use uvmap”
The feather - Normal :
uv2_golden eagle_normal.png “use uvmap.001”
The feather - Alpha :
uv2_golden eagle_normal.png( alpha channel ) “use uvmap.001”