Tube Bird Feeders 

A tube bird feeder offers multiple perch-equipped feeding ports around a seed tube. Each port will accommodate one bird at a time. There are two styles of ports to consider. Large, open ports are best for feeding with mixed seed, black oil sunflower seed, or other seed blends. This style of tube feeder will attract a wide variety of birds, often excluding larger backyard birds. The second style of feeding port resembles a small slit, as it is designed to accommodate Nyjer® seed—a finch favorite.