Perky-Pet 16 oz Hummingbird Oasis Hummingbird Feeder features six feeding ports, an ant moat and holds 16 fl oz of nectar. Easily attaches to wall, window or post. The design is extremely efficient with its flying saucer-like shape that provides ample room for birds to feed. Don't fool yourself, the Oasis actually will be there for the birds as they travel across the barren desert that is your neighborhood, in search of food, ultimately landing at your house! The feeder comes with a brass hanging rod but may also be mounted on a pole. The clear, shatter-proof acrylic reservoir makes it easy to monitor nectar levels and unscrews easily from the feeder base for quick cleaning and filling. The feeder may be cleaned with the Perky-Pet Cleaning Mop. Remember to clean your feeder at least twice a week, more often in very warm climates or seasons.