For the most part I use real heads, even for ducks. Some very fleshy species I use artificial. But even very fleshy ones can be preserved with minimal shrinkage. I just prepared this Harlequin head. With an insulin syringe I injected masterblend into the fleshy corner of the mouth, the upper corners ( don't know the proper name ) and the nostrils. Tomorrow I will paint it and fill the eye sockets with clay and build up the glands above the eye sockets.