#family_Anatidae__Anatidae  swimming birds having heavy short-legged bodies and bills with a horny tip: swans; geese; ducks
  member:  #duck  #genus_Anas  #genus_Tadorna  #genus_Oxyura  #genus_Bucephala  #genus_Aythya  #genus_Aix  #genus_Cairina  #genus_Somateria  #genus_Melanitta  #subfamily_Merginae  #goose  #genus_Anser  #genus_Branta  #subfamily_Anserinae  #genus_Coscoroba  #swan  #genus_Cygnus
  member of:  #order_Anseriformes
  supertype:  #bird_family  a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
     supertype:  #family  (biology) a taxonomic group containing one or more genera; "sharks belong to the fish family"
        supertype:  #taxonomic_group__taxonomicgroup__taxon  animal or plant group having natural relations
           supertype:  #biological_group  a group of plants or animals
              supertype:  #group__grouping  any number of entities (members) considered as a unit
                 supertype:  pm#collection  something gathering separated things (entities/situations)
                    supertype:  pm#divisible_entity__divisibleentity  many classifications under this category are application-dependant
                       supertype:  pm#entity  something that can be "involved" in a situation
                          supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                       supertype:  pm#divisible_thing__divisiblething
                          supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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