The Perky-Pet Perkys Finest 16 oz Plastic Top Fill Hummingbird Feeder is so easy to use! Simply unscrew the cap, pour in your nectar, and youre ready to go. The top fill, wide mouth opening means no spilling through a tiny opening and no inverting after filling. This feeder features a 16 fl oz capacity, 4 soft, decorative flower feeding ports, and a built in ant moat on the lid.