First Nature 32-Ounce Oriole Feeder. The bright orange color attracts the most inquisitive Oriole. With easy-to-fill wide-mouth jar reservoirs and two-part bases, First Nature Oriole Feeders are the easiest feeder on the market to fill and clean. The feeding ports will accommodate several Orioles at a time. With First Nature Oriole Nectar Concentrate, you can mix the correct proportions right in the feeder jar. Feeder can be hung from the s-hook included.