The bat is a liminal thing - our only flying mammal, a dusk dweller and symbol of death and otherness in many cultures. They are also expressive, bizarre, tricksterish, and strangely beautiful - able to hunt and manoeuvre in the dark with consummate skill, moving at the speed of a camera shutter. Battalion is your alternative encyclopedia battanica - a live, writhy cave colony of facts, findings and sonic experiments from a fission-fusion of writers. Add your own inky skitterings to the mix, bring it out on your evening flit. Take after its denizens: open your mouth and listen to the sky.