Modular Hanging Hummingbird Feeder. Clever modular design to attract the most hummingbirds! Stacking modular hanging hummingbird feeders create an endlessly high tower. Each plastic hummingbird feeder unit connects together & includes built-in ant moat. Holds 12 oz. of nectar with two bright yellow feeding ports. Fill your outdoor habitat with the flash of color & activity from feeding hummingbirds.