'The ultimate bat film': in the bat cave with Jeremy Deller – audio slideshow

Patrick Barkham joins artist Jeremy Deller in Texas as he works on his latest new project – a film about the bats at the Frio cave near Concan. The project will be shown as part of Joy in People, Deller's show at London's Hayward Gallery that runs from 22 February to 13 May 2012. Main photography by Scott Dalton