- ostrich - a person who refuses to face reality or recognize the truth (a reference to the popular notion that the ostrich hides from danger by burying its head in the sand)
--1 is a kind of person, individual, someone, somebody, mortal, human, soul
- ostrich, Struthio camelus - fast-running African flightless bird with two-toed feet; largest living bird
--2 is a kind of ratite, ratite bird, flightless bird
--2 is a member of Struthio, genus Struthio - ostrich, Struthio camelus - fast-running African flightless bird with two-toed feet; largest living bird