This is from my book Duck & Goose Addict's Manual. I hope it helps some of you.
Puddle Duck Vocalizations
During the fall most puddle duck hens of the genus Anas (Mallard, Black Duck, Gadwall, Blue-Winged Teal, Green-Winged Teal, Widgeon and Shoveler) use three calls: the Social Contact call, the Decrescendo call and the Incitement call. Drakes of these species use a deeper version of Social Contact call for social contact and as a Mating call.
Hen Social Contact Call
The Social Contact call is used by a hen to keep the family together, it is also used by hens to make other ducks aware of their presence. The hens of most puddle duck species use a slow, shortened version of their Decrescendo call as a Social Contact call; Mallard hens use a simple quack. This call may contain one or more drawn out notes spaced evenly apart; quaack...quaack...quaack. To imitate this call cup your hand over the barrel of the call like you were holding a bottle, and say quack. Your hand should remain cupped while you say the qua portion of the call; open your fingers on the ack.
Hen Mating / Decrescendo Calls
The Decrescendo call is used by hens to announce a willingness to pair bond; it may also be used by hens as general conversation. Although breeding doesn't usually occur until spring, the hens use the Decrescendo when they begin forming pair bonds in the fall. The Decrescendo call sounds just like its Latin name implies; it starts out loud and becomes quieter as the duck runs out of air. The decrescendo of the hen Mallard is often referred to by hunters as the hail, high ball, or greeting call. It usually consists of five to ten notes, with the second note being the loudest and each successive note being softer. But it may be longer; I have heard a hen Mallard string seventeen quacks together while performing the decrescendo. To correctly perform this call the first note should be loud (and can be long), with each of the following notes becoming softer quaack-quack-quack-quack-quack-quack. Most callers leave their hand open while performing this call. Some hunters use a variation of this call with an exaggerated, drawn out first note as a pleading call; and a sharper, more insistent version as a comeback call; quaaack-quack-quack-quack-quack-quack.
The hen Black Duck, Pintail and Shoveler use approximately the same Decrescendo call, and the same pitch as the mallard. The hen Widgeon uses a qua-awk; with 1 to 3 notes. For all of these ducks I use a Mallard call. The hen Gadwall uses the same call, but with a higher pitch. Blue-Wing Teal and Cinnamon Teal use a high pitched quack with 3 to 4 notes, and the last two notes are usually cut off short.
Hen Agonistic / Incitement Calls
Agonistic calls are named for the fact that the animal is agonizing, or arguing. The Incitement call is used by the hen to get her mate to drive another drake away from her; it is a threat call, with the hen telling another duck that if it doesn't leave her alone it may be attacked by her mate. The Incitement call used by hen puddle ducks is usually an insistent rapid call consisting of several short notes The Incitement call of the hen Mallard is referred to as the chuckle or feeding chuckle by hunters. The first time I really began to understand how Mallards used the chuckle was about ten years ago while I was sitting at the small lake near my home feeding geese with my kids; I heard the call and saw a hen mallard feeding with the geese. But, she wasn't feeding she was chasing away a drake mallard. It was quite obvious that the hen was using the chuckle as a form of threat call. I often hear this call in the spring, when two or more drakes are pursuing a hen Mallard in flight.
Although the chuckle is not a feeding call, it does occur in feeding situations, where there are lots of drakes near the hens. In order for the hens to keep from being harassed by single drakes they perform the chuckle (telling other drakes that if they don't stay away they may be attacked by the hen's mate). In order to be able to feed or swim in peace the hens use this call to try to get the drakes to leave them alone. Since ducks often hear the chuckle while they are feeding, or as they approach ducks that are feeding (whether they are on land or water), this call can be used to attract most puddle ducks.
When you use the chuckle to bring in ducks, blow it as it is meant, loud, insistent and aggressive. Do not blow it like a welcome to incoming ducks, or as a pleading call to get other ducks to come down and feed. To imitate the sound of a hen performing this call in flight, cup one or both hands over the end of the call, and rapidly say ticka-ticka-ticka-ticka while you blow into the call. To imitate the sound of a hen performing this call while on land or water I say tuck, tuck-tuck, tuck, tuck, tuck-tuck. I cup both hands over the call, and alternately open the fingers and thumb of the hand that is not holding the call, to create the impression of different sounds coming from different directions.
The hen Black Duck, Gadwall, Shoveler and Widgeon use approximately the same call and pitch as the hen Mallard. The hen Pintail uses a softer, more hoarse call, rrrt-rrrt-rrrt. The hen Blue-Winged and Green-Winged Teal use the same call with a higher pitch. The hen Wood Duck uses a high-pitched whistle, wheet-wheet-wheet
Drake Social Contact and Mating Calls
The drake mallard Social Contact call is simply a deeper more reedy version of the social contact call, usually containing two to four notes; raeb-raeb-raeb-raeb. I often hear this call when one or more drakes are pursuing a hen in the air during spring mating flights, and in large flocks in the fall. I also hear it when drakes are just resting on water or land. The drake Black Duck uses the same call as the drake Mallard. The drake Gadwall uses a higher pitched raeb-zee-zee-raeb-raeb as social contact call. The drake Shoveler uses a woh-woh-woh, or, took'a-took'a-took'a.
For mating calls the Mallard drake also use rarely heard whistle during a less rarely seen mating display, where by the drake quickly stands upright (on its tail with its chest pointed toward the sky) with its neck and headed pointed down (toward the water), and then performs a quiet, high-pitched eeeh (I have it on video). The drake Pintail uses a high pitched whistle, and a burp performed with an outstretched neck, kwa-kwa. The drake Blue-Winged Teal, Green-Winged Teal and Widgeon use a high pitched whistle. For the sounds of these species I use a duck whistle, which you can use on Pintail, Mallard, Teal and Widgeon.
God bless,
T.R.