What is "chiriyakhana"

Chiriakhana or Chiriyakhana (; ) is a 1967 Bengali film by Satyajit Ray. It is a crime drama film, starring Uttam Kumar as Byomkesh Bakshi. The title means "The Zoo". The screenplay is by Sharadindu Bandyopadhyay.The film was once considered as the worst film of Ray because of its complex plot,but nowadays many intellectuals and film experts consider it as the most brilliant movie of Ray.The flexible acting of Uttam Kumar in the movie was praised by many critics at that time.