Hummingbird feeding is now easier than ever with the Perky-Pet 16 oz Glass Top Fill Hummingbird Feeder. The patent pending technology behind this glass Top Fill Feeder allows you to simply open the cap, pour in the nectar, and you are ready to go. Traditional bottom fill feeders only give you a small opening in the bottom of the feeder to pour your nectar, but the convenient wide mouth opening of this Top Fill safeguards against spilling while filling. Hummingbirds will be drawn to the four yellow, soft flower feeding ports. They are the most life-like flowers on the market. The built-in ant moat on the cap has the ability to be filled with water, blocking the ants from accessing the nectar.