Haydel's Diver Duck Call. The Diver Duck Call creates the “Brrrrr” sound that Redheads, Bluebills, Scaup, Canvasbacks, etc. use to communicate. While traditional Mallard Calls have often times been used in a crutch this call has been specifically designed for the purpose of dedicated diver hunters. It features a removable plug in the exhaust barrel for added volume.