It may be possible to use a feeder with a tray beneath (to catch the fragments), and a large non-fixed polycarbonate dome above (to deter pests from above), if the feeder is suspended from a tree with a clear radius of 6 feet around to prevent squirrels or rats jumping onto it…but, this is time-consuming and impossible to achieve in small gardens without the space or trees required. The cheapest option long-term is to plant a variety of shrubs and wildflowers which produce food which is naturally attractive to birds, and can double up as nesting or roosting sites. Most modern bird books have a section on what plants etc will attract particular bird species to the garden, so it may be advisable to focus on this alternative form of ‘bird feeding’ for peace of mind and to avoid getting an unwelcome sight like in the photo above.