The real-life sisters play Irish siblings who speak, love and dream in unison in the new drama from the director of 'Grizzly Man' and 'Fritzcaraldo,' which premiered in competition in Venice.

Sisters Rooney and Kate Mara learned to speak in unison for Werner Herzog's "Bucking Fastard," something that came "surprisingly" easily for them.

Kate and Rooney Mara, who play sisters with a deep and spooky bond in the German's new film, joined the director for a press conference with co-stars Domhnall Gleeson and Orlando…