Sadly, our wildlife is under increasing threat from the reduced and changed nature of rural habitats. This means that our gardens become increasingly valuable 'corridors' for native species. Part of the joy of gardening is the chance encounter with a furry or feathered friend: the green woodpecker on the lawn, or a red spotted going hammer and tongs on a neighbours aerial. Here are some of the things which can provide sanctuary and sustenance for the most welcome of visitors.