Conversion to STL file

Hi . Im new to this. Hopping someone can help me. Im looking at some of the 3D animated animals models that I would like to machine on cnc router machine. For that I need the file to be in STL format. Can someone shine some light on how can I convert those animation formats to STL and have the animal in certain pose of the movement. In the 3D previews I can pose the animation in the pose I like the animal to be. How can I convert the animal to to STL file in that pose. I have Fusion 360.
Thank you