With this Windowsill Feeder, you can watch birds feeding from the comfort of your home. It's easy to install, too -- all you have to do is position the spring-set wooden dowels in the track of your screen window. The feeder itself measures 19 inches wide, and fits double-hung windows measuring 23 inches to 38 inches wide. Made from beautiful cedar, which doesn't need to be treated, as it is weather- and pest-resistant.