The Glass Top Fill Hummingbird Feeder’s patent-pending design is made for simple use and cleaning. For easy filling, simply unscrew the cap of its wide mouth top opening, and pour the nectar in- no inverting necessary! It features four unique soft flower feeding ports, and a built-in ant moat on the lid, preventing ants from feeding on the nectar. All pieces easily unscrew for quick cleaning. Feeder comes in three bottle sizes.