The Barbican Conservatory is the second largest conservatory in London, located at the Barbican Centre. It houses that than 2000 species of plants and trees, as well as birds and fish, including finches, quails, terrapins and koi carp. The conservatory covers 23,000 square feet, and is located on top of the theatre's fly tower. Admission to the conservatory is free but public opening times are very limited; currently only afternoons on Sundays and some Bank holiday Mondays.