Bat Roosts In Rock BACK ORDERA Guide to Identification and Assessment for Climbers, Cavers & Ecology Professionals. This guide provides descriptions of when the bat species resident in Britain and Ireland use natural and human-made rock habitats, how they use them, and the environments each species occupies therein. Descriptions of the features that a climber, caver or professional ecologist might encounter on and in rock habitats where bats roost, as well as discussion of recording criteria, identification of thresholds for suitability for use by particular species and suggestions for handling difficulties when performing a survey. This part of the Bat Rock Habitat Key project. Evidence-supported throughout, with summary reviews of roosting ecology, with illustrative photographs and data.