A good many ducks quack, but not all ducks quack. However, a good old-fashioned quack will attract most ducks—mallards and non-mallards alike. But the ability to sound like different types or species ...

If it walks, waddles and quacks like a duck, it’s probably a mallard but might be a redhead, a scaup, a canvasback, a pintail or some similar pattern. Unlike most casual observers who suffer not if ...