Nyjer feeders hold the small, black, nyjer, or thistle, seed. These feeders attract finches, chickadees, redpolls, pine siskins, and even the occasional downy woodpecker! Our nyjer feeders are easy to clean, which is important for keeping your seed fresh. Nyjer seed can go bad within 2-3 months due to its high moisture content so if sparrows are raiding your nyjer feeder, try an upside-down feeder. Finches can feed while hanging upside down but sparrows cannot.