The tube may have perches attached or be surrounded with wire mesh. It may have a tray at the bottom to catch spilled seed. Tube feeders can be hung or mounted on poles. The size of the perches and the bottom tray determine which birds can use the feeder. Mine is oak.
Many birds find the suet when they use the branch as a perch on their way to the other feeders.
Coat pine cones with suet or a peanut butter mixture and roll in seeds. Hang in clusters. Drill holes of various sizes in a small log and fill them with suet or a peanut butter mixture. Attach a cup hook and hang. Suet feeders attract insect-eating birds.