House sparrows have made their homes close to human habitation for centuries but since the 1970s their numbers have plummeted by 60 per cent and the decline is particularly noticeable in our towns and cities. Why is this happening? On this episode of Nature’s Voice Jane Markham meets Dr Will Peach, head of research delivery at the RSPB to look at the latest theories and talks to RSPB wildlife gardener Adrian Thomas to find out how to look after sparrows in our gardens.