Bat Roosts In Trees BACK ORDERA guide to indentification and assessment for tree care and ecology professionals. This is a guide to finding tree roost centered on work in the U.K. It is the result of the collaborative efforts of professional surveyors and amateur naturalists across Europe as part of the Bat Tree Habitat Key project. Evidence-supported throughout, with summary reviews of roosting ecology. Covers the 14 tree-roosting species found in Britain, with illustrative photographs and data. A practical analysis framework with clearly identifiable thresholds for action.