Hummerfest Feeder. High-impact polycarbonate construction. Rain deflectors and built-in ant moats deter insects and prevent contamination. The 8 oz. Hummerfest Hummingbird Feeder is a complete feeder kit designed to complement the backyard of any nature enthusiast that wants to attract hummingbirds. This feeder holds 8 oz. of nectar and by holding a smaller quantity there is less waste. Hummingbirds like fresh nectar, it should be changed every couple days, especially in very hot weather.