#breeding_ground  a place where animals breed
  supertype:  #piece_of_land__tract__piece_of_ground__parcel_of_land__parcel  an extended area of land
  subtype:  #pesthole  a breeding ground for epidemic disease
  subtype:  #rookery  a breeding ground for gregarious birds (such as rooks)
     subtype:  #heronry  a breeding ground for herons; a heron rookery

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