The bone object on your web site is a section or connected sections of a normal skull of a normal animal. The 'eye' and 'nasal' like holes are inner cranial passages. The smooth hat like section on top is actually part of the original outer surface of the skull from the top of the head. The spongy rough material is exposed bone from the inner skull. The front part of this skull has been smashed away. My guess from quick inspection is a common hoofed animal.