An opium bird is not a known term or concept. The term "opium" refers to a narcotic analgesic derived from the opium poppy plant, which is the only commercial source for the narcotic analgesics morphine and codeine. Opium poppy is an ancient medicinal plant that has been used for centuries to produce painkilling drugs still used in modern medicine. The opium poppy plant is also known for its exploitation through illicit trade. The term "opium bird" does not appear in any of the search results, and it is not clear what it refers to.