Easily the most widely preferred seed for feeding birds. All testing shows that more species of birds pick black oil as their top choice for food at feeder stations. It is high in oil and fat and has a soft shell so that even small birds like finches can easily crack it open. If you want to keep it as simple and as economical as possible, just feed black oil and you will be happy with the birds you attract. Available in 8lb, 25lb & 50lb bags