The Northern Shoveler inhabits wetlands across much of North America and it is easily distinguishable from other waterfowl due to its large spatulate bill. The ¼ inch regulator disc can be used when the feed is millet or mash. The 3/8-inch regulator disc from PECk-O-MATIC Automatic Duck Feeder can be used when crumble or milo make up the feed.