Use the proper materials. Wood is the best material for birdhouses. Other materials (like metal or plastic) may not insulate the nest enough, so eggs or young could become chilled in cold weather or overheated in warm, sunny weather. Use rough_cut wood slabs, tree sections, or 3ǚ_inch plywood. Never use creosote_treated wood as creosote may kill the eggs or chicks.
When to Feed Birds. Some birds will visit feeders year_round once they are familiar with the location of a dependable food supply. Birds are most easily attracted in winter, however, because natural food supplies are least abundant then. Feeders should be set up in late summer or early fall, then maintained through the winter and spring until natural food sources are again abundant.