#young_bird__youngbird  a bird that is still young
  supertype:  offspring__young  any immature animal
  member of:  class_Aves
  subtype:  fledgling__fledgeling  young bird that has just fledged or become capable of flying
  subtype:  baby_bird__nestling  young bird not yet fledged
  subtype:  eaglet  a young eagle
  subtype:  chick__biddy  young bird especially of domestic fowl
  subtype:  cygnet  a young swan

No statement uses or specializes young_bird; click here to add one.