The musk duck (''Biziura lobata'') is a highly aquatic, stiff-tailed
duck
Duck is the common name for numerous species of waterfowl in the family Anatidae. Ducks are generally smaller and shorter-necked than swans and geese, which are members of the same family. Divided among several subfamilies, they are a form t ...
native to southern
Australia
Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...
. It is the only living member of the
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
''
Biziura
''Biziura'' is a genus of stiff-tailed ducks endemic to Australasia and containing one living and one subfossil species.
Species
* †''B. delautouri'' Forbes, 1892 – New Zealand musk duck – previously endemic to New Zealand, and occurri ...
''. An
extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
relative, the
New Zealand musk duck or de Lautour's duck (''B. delautouri''), once occurred on
New Zealand
New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...
, but is only known from
prehistoric
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of ...
subfossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in ...
bones. It was about 8% longer than the living
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
, with a particularly large head.
[
This animal derives its common name from the peculiar musky odour it emanates during the breeding season. Musk ducks are moderately common through the Murray-Darling and ]Cooper Creek
The Cooper Creek (formerly Cooper's Creek) is a river in the Australian states of Queensland and South Australia. It was the site of the death of the explorers Burke and Wills in 1861. It is sometimes known as the Barcoo River from one of its t ...
basins, and in the wetter, fertile areas in the south of the continent: the southwest corner of Western Australia
Western Australia (commonly abbreviated as WA) is a state of Australia occupying the western percent of the land area of Australia excluding external territories. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to th ...
, Victoria
Victoria most commonly refers to:
* Victoria (Australia), a state of the Commonwealth of Australia
* Victoria, British Columbia, provincial capital of British Columbia, Canada
* Victoria (mythology), Roman goddess of Victory
* Victoria, Seychelle ...
, and Tasmania
)
, nickname =
, image_map = Tasmania in Australia.svg
, map_caption = Location of Tasmania in AustraliaCoordinates:
, subdivision_type = Country
, subdi ...
.
Description
Adult males are long and have a distinctive large, leathery lobe underneath the bill; females are long and unadorned. Their drab dark grey-brown, slightly pin-striped plumage
Plumage ( "feather") is a layer of feathers that covers a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies and may vary with age classes. Within species, ...
is inconspicuous and does not differ between the sexes. This species weighs an average of in males and in females, with the smallest females weighing only and the largest males weighing up to . On average, they are the second-heaviest diving duck in the world after the common eider
The common eider (pronounced ) (''Somateria mollissima''), also called St. Cuthbert's duck or Cuddy's duck, is a large ( in body length) sea-duck that is distributed over the northern coasts of Europe, North America and eastern Siberia. It bree ...
, with male musk ducks actually being slightly heavier than male common eiders, but female eiders being rather larger than female musk ducks due to that species' lesser size sexual dimorphism.[''CRC Handbook of Avian Body Masses, 2nd Edition'' by John B. Dunning Jr. (Editor). CRC Press (2008), .] Musk ducks float very low in the water, almost like a cormorant
Phalacrocoracidae is a family of approximately 40 species of aquatic birds commonly known as cormorants and shags. Several different classifications of the family have been proposed, but in 2021 the IOC adopted a consensus taxonomy of seven ge ...
, and the large, webbed feet are well back on the body. The ducklings are covered in dark brown down.
In its native range, the fanned tail is distinctive, allowing to distinguish this species from the freckled duck
The freckled duck (''Stictonetta naevosa)'' is a waterfowl species endemic to Australia. The freckled duck has also been referred to as the monkey duck or oatmeal duck. These birds are usually present in mainland Australia, but disperse to coas ...
(''Stictonetta naevosa'') which has similar size, colouration, and habits. The blue-billed duck
The blue-billed duck (''Oxyura australis'') is a small Australian stiff-tailed duck, with both the male and female growing to a length of 40 cm (16 in). The male has a slate-blue bill which changes to bright-blue during the breeding se ...
(''Oxyura australis'') has a similarly shaped tail, but the main colour of its males in breeding plumage is a much richer chestnut brown. Females and males in nonbreeding plumage are very similar, however, and if one is not intimately familiar with the slight differences in behaviour, they cannot be told apart from female musk ducks at a distance. Male musk ducks in the breeding season are usually unmistakable due to the large bill lobe.
Systematics
The relationships of this peculiar species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
are quite enigmatic. It is traditionally included with the stiff-tailed duck subfamily
In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end subfamily botanical names with "-oideae", and zoologi ...
Oxyurinae
The Oxyurini are a tribe of the duck subfamily of birds, the Anatinae. It has been subject of considerable debate about its validity and circumscription. Some taxonomic authorities place the group in its own subfamily, the ''Oxyurinae''. Most of ...
, but appears to be only distantly related to the genus '' Oxyura'', and its peculiar apomorph
In phylogenetics, an apomorphy (or derived trait) is a novel character or character state that has evolved from its ancestral form (or plesiomorphy). A synapomorphy is an apomorphy shared by two or more taxa and is therefore hypothesized to have ...
ies make it difficult to place. Its relationship with the equally strange pink-eared ducks (''Malacorhynchus
''Malacorhynchus'' is a genus of duck within the family Anatidae. It was established in 1831 by English ornithologist William John Swainson, when he proposed moving the pink-eared duck into a subgenus (''Malacorhynchus'') based on unique charact ...
'') is unresolved, but seems to be quite close, and it seems to be part of an ancient Gondwana
Gondwana () was a large landmass, often referred to as a supercontinent, that formed during the late Neoproterozoic (about 550 million years ago) and began to break up during the Jurassic period (about 180 million years ago). The final stages ...
n radiation
In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium. This includes:
* ''electromagnetic radiation'', such as radio waves, microwaves, infrared, visi ...
of Anatidae
The Anatidae are the biological family of water birds that includes ducks, geese, and swans. The family has a cosmopolitan distribution, occurring on all the world's continents except Antarctica. These birds are adapted for swimming, floating ...
. As such, it is fairly closely related to the stiff-tailed ducks proper, but it seems not quite as closely related as formerly believed, with many similarities due to convergent evolution
Convergent evolution is the independent evolution of similar features in species of different periods or epochs in time. Convergent evolution creates analogous structures that have similar form or function but were not present in the last com ...
.[
]
Ecology and status
This species prefers deep, still lakes and wetlands with areas of both open water and reed beds. They seldom emerge from the water and are awkward on dry land. They rarely fly: take off is made with difficulty, and landing 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 m (about 20 ft). The primary diet items are water beetle
A water beetle is a generalized name for any beetle that is adapted to living in water at any point in its life cycle. Most water beetles can only live in fresh water, with a few Marine (ocean), marine species that live in the intertidal zone or l ...
s, yabbies, freshwater snail
Freshwater snails are gastropod mollusks which live in fresh water. There are many different families. They are found throughout the world in various habitats, ranging from ephemeral pools to the largest lakes, and from small seeps and springs ...
s and shellfish
Shellfish is a colloquial and fisheries term for exoskeleton-bearing aquatic invertebrates used as food, including various species of molluscs, crustaceans, and echinoderms. Although most kinds of shellfish are harvested from saltwater envir ...
, and the like, supplemented with a variety of aquatic plants and a few fish
Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of li ...
.
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. 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.
Reproduction
The musk duck breeding season varies with rainfall and water levels, but is typically between July and January, with the greatest number of clutches laid in September or October, the austral spring. Despite a number of more general studies, little is known about musk duck breeding. During breeding season, they give off the musky odour from which the species derives its common name. Also, 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.
Mating is thought to be promiscuous, quite possibly on a lek
Lek or LEK may refer to:
* Lek mating, mating in a lek, a type of animal territory in which males of a species gather
* Albanian lek, the currency of Albania
* Lek (magazine), a Norwegian softcore pornographic magazine
* Lek (pharmaceutical comp ...
system like that of the kakapo (a very large, flightless parrot found only in New Zealand
New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...
), 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 cover 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 platform of trampled plant material with a slight cup, lined with fine plant matter and, after the eggs
Humans and human ancestors have scavenged and eaten animal eggs for millions of years. Humans in Southeast Asia had domesticated chickens and harvested their eggs for food by 1,500 BCE. The most widely consumed eggs are those of fowl, especial ...
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 is unknown: as many as 10 eggs have been counted in a nest, but it seems likely that this is the result of dump nesting: three or four eggs are considered more likely. In most cases, only one duckling survives, sometimes two. They are able to swim and 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.
Conservation status
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
Salinity () is the saltiness or amount of salt dissolved in a body of water, called saline water (see also soil salinity). It is usually measured in g/L or g/kg (grams of salt per liter/kilogram of water; the latter is dimensionless and equal ...
levels, but the species is not presently considered to be in danger.
1987 speech mimicry tape rediscovered
In September 2021, reports circulated about a rediscovered tape that originally was recorded in 1987 of a musk duck named Ripper at Tidbinbilla Nature Reserve
Tidbinbilla Nature Reserve is a protected area, on the fringe of Namadgi National Park. Tidbinbilla is a short drive from the capital city of Australia, Canberra, in the Australian Capital Territory.
The nature reserve consists of a large val ...
in the Australian Capital Territory
The Australian Capital Territory (commonly abbreviated as ACT), known as the Federal Capital Territory (FCT) until 1938, is a landlocked federal territory of Australia containing the national capital Canberra and some surrounding townships. ...
, who appeared to be the first duck recorded to mimic human speech. Reportedly, the recording demonstrates the duck saying ''"you bloody fool"'', possibly repeating a catchphrase from one of the caretakers of the reserve. Although other bird species are capable of mimicking human speech, no other duck species is reported to have that capability.
References
External links
{{Taxonbar, from=Q917356
Anatidae
musk duck
The musk duck (''Biziura lobata'') is a highly aquatic, stiff-tailed duck native to southern Australia. It is the only living member of the genus '' Biziura''. An extinct relative, the New Zealand musk duck or de Lautour's duck (''B. delauto ...
Birds of New South Wales
Birds of South Australia
Birds of Tasmania
Birds of Victoria (Australia)
Birds of Western Australia
Endemic birds of Australia
musk duck
The musk duck (''Biziura lobata'') is a highly aquatic, stiff-tailed duck native to southern Australia. It is the only living member of the genus '' Biziura''. An extinct relative, the New Zealand musk duck or de Lautour's duck (''B. delauto ...
Oxyurinae
Articles containing video clips
Taxa named by George Shaw