- Cygnus - a constellation in the northern hemisphere between Pegasus and Draco in the Milky Way; contains a black hole
--1 is a kind of constellation
--1 has member: Deneb; Northern Cross- Cygnus, genus Cygnus - a genus of Anatidae
--2 is a kind of bird genus
--2 is a member of Anatidae, family Anatidae
--2 has members:mute swan, Cygnus olor; whooper, whooper swan, Cygnus cygnus; tundra swan, Cygnus columbianus; trumpeter, trumpeter swan, Cygnus buccinator; black swan, Cygnus atratus - Cygnus, genus Cygnus - a genus of Anatidae