First Nature 16-Ounce Hummingbird Flower Feeder. The bright red color attracts the most inquisitive hummingbirds. With easy-to-fill wide-mouth jar reservoirs and two-part bases, First Nature Humming bird Feeders are the easiest feeder on the market to fill and clean. The feeding ports will accommodate several hummer's at a time. With First Nature Hummingbird Nectar Concentrate, you can mix the correct proportions right in the feeder jar. Feeders can be hung from the included s-hook.