3.4 Location of key sites and feeding areas 3.4.1 Finding roosts in houses, trees orb bother structures Promoting reports of roosts The great majority of records of bat roosts arise from requests for advice from householders. In order to maximise the numbers of reports of bats received by yourself or your bat group, it is useful to develop good relations with the local building professions because they are most likely to come across bats or signs of bats during their work. Other than this, possible roost sites can be found in a number of ways. Placing posters that request details of any known roosts in public places, such as petrol stations, shops and post offices, is a relatively simple and cheap technique. Similarly, appealing CHAPTER 3 SURVEY AND MONITORING for information through local newspapers, television and radio is a good way to stimulate public interest in bats and produce a list of potential roost sites. Posting questionnaires or leaflets with a returnable slip through letterboxes of every building or a proportion of buildings selected at random in the study area is a slightly more costly method but is probably the most thorough way of locating roosts in buildings. A much higher response rate will be achieved if you provide a stamped addressed envelope, although this will increase costs. With all of these methods, respondents claiming to have roosting bats in their building, or knowledge of a roost elsewhere, should be contacted by telephone and, where possible, the site visited to validate their claim and identify the species concerned. Speakman et al. (1991) is a good example of the use of these methods in a survey conducted in Scotland.