In many areas of the Northeast, squirrels have become marauding thugs, stripping fruit trees, berry bushes, and birdfeeders. The weight of a squirrel closes the ports of this feeder, but it serves both perching and clinging birds perfectly. Perches may also be removed to deter large birds such as grackles and doves. The central clear plastic tube holds 1.4 quarts of seed; a patented ventilation system keeps seed fresh. Measures 20" tall, 4" in diameter; 11" wire hanger. Dismantles easily (no tools required) for cleaning.