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Musk Ducks are highly aquatic, stiff-tailed ducks native to southern Australia.

They are moderately common through the Murray-Darling and Cooper's Creek basins, and in the wetter, fertile areas in the south of the continent: the south-west corner of Western Australia, Victoria, and Tasmania. Musk Ducks avoid the far north, or the arid west and north-west. They prefer deep, still lakes and wetlands with areas of both open water and reed beds.

Adult males are 60 to 70 cm long and have a distinctive large, leathery lobe underneath the bill; females are 47 to 55 cm long and unadorned. The large webbed feet are well back on the body, and the fanned tail is distinctive: in Australia, only the Blue-billed Duck has a similarly shaped tail.

Musk Ducks float very low in the water, almost like a cormorantCormorants Red-faced Cormorant : Animalia : Chordata : Aves : Pelecaniformes Phalacrocoracidae Genera Nannopterum ''Phalacrocorax Leucocarbo The Phalacrocoracidae family of birds is represented by over thirty species of cormorants and shags . All but thre, and their dark grey-brown, sightly pin-striped plumage is initially drab and unattractive. They seldom emerge from the water and are awkard on dry land. They rarely fly: take off is made with with difficulty, and splash down is a clumsy, low-angled affair with no attempt to lower the feet. However, at need Musk Ducks fly swiftly and for long distances, with rapid, shallow wing beats.

In the water, Musk Ducks display an effortless agility, twisting and turning on the surface with both feet and tail. In general, Musk Ducks remain in the water all day long, alternately loafing and feeding energetically, though they sometimes emerge to sit on a log or on dry land for a while. They stay on the water at night, sleeping well out from land with the head tucked into the body or under a wing.

Musk Ducks are very much at home below the surface, slipping under head-first with barely a ripple, and staying submerged for as long as a minute at a time, often resurfacing only for a few moments before diving again. They dive to escape predators or unwanted company, and to search for food, typically in fairly deep water. They can descend to at least 6 metres (about 20 feet). The primary diet items are water beetleA water beetle is a beetle adapted for living in water. A number of different types are known, all living in or on fresh water. Water beetles carry an air bubble underneath their abdomens, which both provides an air supply, and prevents water from gettings, yabbies, water snail s, freshwater shellfish, and the like, supplemented with a variety of aquatic plants and a few fishAtlantic herring, Clupea harengus one of the most abundant species in the world Photo A fish is a poikilothermic (cold-blooded) water-dwelling vertebrate with gills. There are over 27,000 species of fish, making them the most diverse group of vertebrates..

When not breeding, adults are generally solitary. Adult males hold and defend territories, excluding other males and quite often females too. Younger birds—juveniles and unmated adults—form flocks on larger bodies of water at some times of year.

The Musk Duck breeding season varies with rainfall and waterlevels, but is typically between July and January, with the greatest number of clutches laid in September or October. Despite a number of more general studies, remarkably little is known about Musk Duck breeding: in the season males advertise themselves loudly with a repetitive sequence of sounds: first, a ker-plonk splash made with the feet on the surface of the water; then two soft, sharp cuc cuc calls; then a loud whistle and a deep grunt. This sequence can be started at any time of day or night, with or without an associated visual display, and repeated every 4 or 5 seconds for as long as half an hour at a time. Although male Musk Ducks have a large leathery lobe below the bill and this swells during the breeding season, it is not connected to the vocal cavities and appears to be purely for visual purposes.

It is thought that mating is promiscuous, quite possibly on a lekA lek (from Swedish lek a noun which typically denotes pleasurable and less rule-bound games and activities) is a gathering of the males of certain species of animals for the purposes of competitive mating display. The places where leks occur are often th system like that that of the KakapoThe Kakapo ( Maori for night parrot , Strigops habroptilus ("owl-faced soft feathers"), is a species of nocturnal parrot endemic to New Zealand. It is notable for being the world's only flightless parrot, the heaviest parrot, and the only parrot to have a (a very large, flightless parrot found only in New ZealandFor alternative meanings, see New Zealand (disambiguation). New Zealand is a country formed of two major islands and a number of smaller islands in the southwestern Pacific Ocean. A common Mori name for New Zealand is Aotearoa popularly translated as Land), but this remains uncertain. The male plays no part in building the nest or raising the young.

Females select a secluded location for nesting, usually in tall reeds well away from land and protected by deep water, or under the covor of overhanging shrubbery, but sometimes in a range of innovative places, such as on a stump, in a hollow log, or even under an upturned boat. The nest is a simple and rather platform of trampled plant material with a slight cup, lined with fine plant matter and, after the eggs are laid, plenty of down. She seems to be unable to carry nest material and must rely on whatever is within reach. With the nest complete, she pulls reeds down from overhead to make a canopy, hiding it from view. When leaving the nest to feed, she slips quietly into the water and submerges, not surfacing until she is well away from it.

Clutch size in unknown: as many as 10 eggs have been counted in a nest, but it seems likely that this is the result of dump nesting: 3 or 4 eggs is considered more likely. In most cases only one chick survives, sometimes two. They hatch already covered in dark brown down and are able to swim, dive within a few days, after which they probably leave the nest. Young stay close to the mother for several months at least, sometimes riding on her back to begin with. They can peck at food items on the surface and dive a little while still quite small, but the mother continues to provide the bulk of their food until they are almost full-grown.

It is not known at what age they reach sexual maturity in the wild, but it may take several years. They are a long-lived species and are still capable of breeding when 20 years old or more.

Musk Ducks are sometimes shot by hunters but are little prized, not being considered good eating. Wholesale clearing and draining of wetlands has impacted on their numbers, as has the widespread rise in Australian water salinity levels, but the species is not presently considered to be in danger.