#horny_structure__hornystructure__unguis  any rigid body structure composed primarily of keratin
  supertype:  #anatomical_structure__structure__complex_body_part__bodily_structure__body_structure  a particular complex anatomical structure; "he has good bone structure"
  subtype:  #hoof.horny_structure  the horny covering of the end of the foot in hoofed mammals
  subtype:  #claw  sharp curved horny process on the toe of a bird or some mammals or reptiles
     subtype:  #bear_claw  claw of a bear; often used in jewelry
     subtype:  #talon  a sharp hooked claw especially on a bird of prey
  subtype:  #nail.horny_structure  horny plate covering and protecting part of the dorsal surface of the digits
     subtype:  #fingernail  the nail at the end of a finger
        subtype:  #thumbnail  the nail of the thumb
     subtype:  #toenail  the nail at the end of a toe
        subtype:  #ingrown_toenail__ingrowntoenail__onyxis  toenail having its free tip or edges embedded in the surrounding flesh

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