argentine lake duck male

Try to imagine that on a human male, and for the sake of context, imagine it being about eight feet long. S. R.Derrickson, and Like other stifftails (Nomonyx and Oxyura), the Argentine Lake Duck is nested within a clade of promiscuous, dichromatic congeners that share many derived social and morphological characters (McCracken et al. Seven adult male Argentine Lake Ducks were collected early in the breeding season on 22 November 1998 from a small wetland (n = 2) and irrigation canal (n = 5) adjacent to the Río Negro near General Conesa, Río Negro, Argentina (40°04′S, 64°16′W). Forced copulation results in few extrapair fertilizations in Ross's and Lesser Snow geese. Notes: - The Lake Duck is also sometimes called the Argentine Ruddy Duck, Argentine Blue-billed Duck, or Argentine Blue-bill and is a South American stiff-tail duck. Pair bonds that have been observed probably reflect nothing more than short-term relationships for copulation or mate guarding. Each of the five birds that I dissected appeared to be in breeding condition, as indicated by a bright blue bill, black head, and ruddy breeding plumage. These displays, which can be quite vigorous and prolonged, typically are performed in the presence of many males and often in arena-like contexts. The lake duck's penis is corkscrew-shaped and retracts into the abdomen when not required. Postcopulatory preening of the penis, likewise, appears to be common in both species (P. J. Fullagar and B. Brua pers. Lake ducks are small, around 640 grams (23 oz), and about 40 cm (16 inches) in length. Follet Eds. The penis of the Argentine Lake Duck measures approximately half the body length and exhibits proportions comparable to those found in fleas and some nematodes and flies; male genitalia in these invertebrates often exceed the length of the body and can be the most structurally complex organs in the entire body (Hyman 1951, Thornhill and Alcock 1983). Eversion to a centimeter or so, nonetheless, revealed a dense array of black-tipped, white spines at the base of the penis. However, longitudinal dissection and subsequent inversion of the outer surface to view the inner surface revealed what is believed to be a close approximation of the everted, but nonetheless flaccid conformation (see below). Manually everting the organ in its erect conformation proved impossible given the absence of a vascular eversion mechanism (King 1981). Download this stock image: Argentine Lake Duck, male / (Oxyura vittata) / Argentine Blue-bill, Argentine Ruddy Duck - X6MN68 from Alamy's library of millions of … Fact 1: Duck penises can be very long Duck penises come in all shapes and sizes. Total length of the penis tube as measured from the base of the cloaca to the bend of the loop was 22.3 ± 2.1 cm (range 19.0 to 24.5 cm; Fig. Several groups of birds, including ratites, screamers, waterfowl, and cracids, possess well-developed male copulatory organs (Forbes 1882, King 1981, Lake 1981). Leigh-Sharpe 1922, Simmons and Siva-Jothy 1998). Does the Argentine Lake Duck penis recrudesce after the breeding season in a similar fashion, and if so, do the same hormones that regulate the testes cycle control the seasonal development of the penis? The Argentine Blue-bill or Argentine Lake Duck (Oxyura vittata) can have 42.5 cm (17 inches) long penises, at an average body length of 20 cm (8 inches)! One last functional question concerns the topic of sperm displacement. Classification: - Family: Anatidae, Subfamily: Oxyurinae, Genus: Oxyura. A. D.Afton, So, let's review: At the base if the argentine lake duck cock, there is a crown of thorns, followed by a spiralling, corkscrewing, pig-like shaft covered in spines and spikes, followed by a broom. It furthers the University's objective of excellence in research, scholarship, and education by publishing worldwide, This PDF is available to Subscribers Only. P.Mineau. The lowland counterpart to the very similar Andean Duck; the two species may occur together in a few places, but Andean Duck is rare in lowlands, where Lake Duck is the default species. 1E). Image: Glen Bowman via Flickr. Species that experience greater sperm competition are expected to possess larger penes that may increase the probability of successful fertilization (Birkhead and Møller 1992, Briskie and Montgomerie 1997). 1B). Unusually large testes size, elaborate sexual display repertoires, and a putatively promiscuous mating system offer opportunities for speculation about the relationship between form and function of the unusual penis in this species. Once the season ends, the penis begins to shrink and regress until it’s 10 per cent of its full-grown size. Birkhead, A.P. Carcasses subsequently were placed on ice, frozen, and exported to the Louisiana State University Museum of Natural Science (LSUMNS). A guide to the snake hemipenis: A survey of basic structure and systematic characteristics. Cerca qui la traduzione tedesco-spagnolo di argentine Lake duck 38 nel dizionario PONS! So females seem to have evolved vaginas that make it hard for a male duck … University of British Columbia, Vancouver. Subsequent dissection and unraveling from the two membranes revealed the inverted penis to be an elongated, blind-end, tube-like structure attached to the cloaca at both ends. The use of the waterfowl penis as a means of sex and age identification of live birds is commonplace (e.g. No other notable traits were revealed by further manipulation of the cloaca. No need to register, buy now! For most species of birds, well-developed penes or intromittent organs are absent (e.g. The testes of birds undergo substantial changes in size, often enlarging greatly during the breeding season and then shrinking to become almost invisible (Witschi 1935, Wingfield and Farner 1980). Notes on the Blue-billed Ducks at Lake Wendouree, Ballarat. Year-round maintenance may be more probable because Argentine Lake Ducks are likely to be sexually active throughout most of the year, and like other Southern Hemisphere waterfowl, they lack the sharply defined seasons of breeding activity typical of ducks in the far north. Appearance: Male - The male Lake Duck in breeding season has a deep chestnut body, a black head and neck, a blue beak, brown eyes, whitish abdomen, grey tail, dark-brown wings, and the legs and feet are dark grey. Females also might choose among males in yet another manner, based on the size and appearance of the penis itself (Briskie and Montgomerie 1997). While most male birds have no external genitalia, male waterfowl have a phallus. S. Karger, Basel, Switzerland. Teasing apart the two processes can be difficult, however, particularly when the contest occurs inside the female. comm.). The presence of a well-developed penis in many dabbling and diving ducks may derive in part from their tendency to copulate in the water (Lake 1981). With the exception of a video sequence and numerous observations of copulating Australian Blue-billed Ducks (Oxyura australis) everting and preening (postcopulatory) similar-sized penes (E. Slater and P. J. Fullagar pers. From this point distally, the penis tapered gradually to the opposite end where it inserted the cloaca ventral to the insertion point of the base of the penis. Lake Duck at WWT Slimbridge. Masses averaged 5.4 ± 1.3 g for the left testis and 5.4 ± 1.9 g for the right testis (left testis range 4.3 to 7.0 g; right testis range 3.9 to 8.6 g). Within the cloacal orifice, the base of the penis is clearly visible as an inverted blind-end tube arising from the ventral wall of the cloaca and penetrating well into the body cavity, not unlike the Mallard (Anas platyrhynchos) penis (King 1981). Die männliches Begattungsorgane der Hausente. comm. Sperm competition, sperm depletion, paternal care, and relative testis size in birds. On the behaviour of the White-headed Duck with special reference to breeding. Without regard to size, such structures are uncommon in birds but are present in nonavian groups including crocodiles and turtles (King 1981). King 1981, Briskie and Montgomerie 1997). The genitals of male birds generally are not noted for their size or extravagant ornamentation. A large blood vessel extended along the entire length of the organ. © The American Ornithologists' Union, 2000, 2020 AOS William Brewster Memorial Awards to Regina Macedo, 2020 AOS William Brewster Memorial Award to John Rotenberry, 2020 Ralph W. Schreiber Conservation Award to Jaime Collazo, About the American Ornithological Society, Receive exclusive offers and updates from Oxford Academic, Copyright © 2020 American Ornithological Society. F., More than 500,000 images and video clips online, from tigers to turtles and elephants to sharks. Oxford University Press is a department of the University of Oxford. A report back in 2011 in Nature described this animal as having the longest bird penis on … Limited information about the social behavior and mating habits of Argentine Lake Ducks suggests that peculiarities of size, ornamentation, and the potential for sperm displacement have evolved in conjunction with a promiscuous, group-display mating system. Another question that comes to mind concerns sperm flow and ejaculation. While most birds don’t have a penis, ducks are one of the few birds that do. I thank Daniel Blanco, Raúl Cardón, Claudio Chehébar, Raúl Clarke, Mike Christie, Donna Dittman, Martin Funes, Sergio Goldfeder, Manuel Nores, and Alejandre del Valle for their assistance locating stifftail ducks or help exporting and importing specimens. As one proceeds distally, however, the spines diminish in number, become soft and brush-like, and take on a more ochre color, until at the distal terminus they disappear altogether; at this point the outer sheath inverts to become the inner sheath that extends proximally toward the base of the penis. Male - The male Lake Duck in breeding season has a deep chestnut body, a black head and neck, a blue beak, brown eyes, whitish abdomen, grey tail, dark-brown wings, and the legs and feet are dark grey. Sperm transfer occurs via the mutual juxtaposition of the protruded cloacae, and there is relatively little contact between males and females compared with the process of coital penetration in mammals, reptiles, some species of fish, and most insects (Eckstein and Zuckerman 1956, Dowling and Savage 1960, Eberhard 1985). ... Lake Duck or Argentine Ruddy Duck 2 militaryairshows. North American scientists have discovered the longest bird penis ever - a 42.5cm organ belonging to a duck. Sexual selection and the intromittent organs of birds. Do male Argentine Lake Ducks use the coarse spines at the base of their penis to clasp the female as morphology would predict, and does the softer brush-like distal half of the penis remove sperm deposited by other males? Trainer lessicale, tabelle di coniugazione verbi, funzione di pronuncia gratis. McKinney, A small foreskin-like structure with no spines and measuring 7.2 ± 1.3 mm (range 6 to 9 mm) arises dorsally from the base of the penis (see Fig. Appearance: Lake duck - Argentijnse stekelstaart - Oxyura vittata on Vimeo The probability that the complexity of this organ developed in response to male competition for limited access to females also seems high given the obvious social and phylogenetic correlates (Birkhead and Møller 1992, Briskie and Montgomerie 1997). Conservation status (IUCN 3.1): After discovering unusually large cloacal swellings and correspondingly large penes in the first two specimens, I dissected and measured the intromittent organs and testes of the five birds collected on the canal (LSUMNS B34019, B34025, B34034, B34036, B34037). Control of seasonal reproduction in temperate zone birds. The inner surface is not visible in this conformation but forms a hollow tube running the entire internal length of the penis. Is it a coincidence that such a large structure has evolved in a diving duck with high wing loading that rarely flies? The lake duck holds the Guinness World Record for having the largest avian reproductive organ, from a specimen in Córdoba, Argentina that had a penis measuring 42.5 centimetres (16.7 in). Hochbaum 1942). The lake duck (also called Argentine blue-bill) has the largest penis in relation to body size of all vertebrates; while usually about half the body size (20 cm), a specimen with a penis 42.5 cm long is documented. 1F). 1A). The outer surface of the sheath (which appears inverted in the abdominal cavity) possesses the spines. https://www.sciencephoto.com/media/993286/view/argentine-lake-duck-pair- First is the question of size and seasonal recrudescence. Mechanical eversion of the penis in its erect conformation was not possible given its unusual length and narrow width. Mass of the two testes combined averaged 10.8 ± 3.1 g (range 8.2 to 15.6 g), or 1.7 ± 0.5% of total body mass (range 1.4 to 2.4%). J.Harshman, Does sperm proceed via a longitudinal sulcus in the Argentine Lake Duck as it does in other species? Dissection and preparation of the Argentine Lake Duck's penis reveal a massive structure (approximately equal in length to the Ostrich penis) with a peculiar array of dense spines running the entire length of the organ. Other birds lack sperm ducts in their penes, and instead rely on spiral grooves to channel the flow of sperm. Image of british, wildlife, nature - 32163411 Mass (± 50 g) of each bird was measured at the time of collection. Huge collection, amazing choice, 100+ million high quality, affordable RF and RM images. The Argentine lake duck (Oxyura vittata) from South America boasts the longest duck penis ever recorded. Thus, sperm competition probably also explains the contrast between the larger penes of dabbling ducks and the smaller penes of geese. For the Argentine Lake Duck, a number of functional questions remain. Spines also are arranged along a series of spiral grooves extending the entire length of the everted penis (Fig. R.J. Reiter, B.K. Genitalia and testes subsequently were fixed in 10% formaldehyde, preserved in 70% ethanol, and deposited at the Louisiana State University Museum of Natural Science. Argentine Lake Duck: 17 Inches ... Curly and noodle-like, resembling its tail, the male pig has a notoriously impressive member. The most notable of these includes a series of shared stereotyped sexual displays that collectively set Oxyura (and probably Nomonyx) apart from all other waterfowl (Carbonell 1983, Marchant and Higgins 1990, McCracken et al. Comparative studies of stiff-tailed ducks (tribe Oxyurini: Anatidae). Ducks are known to detain the record of penis size amongst vertebrates, compared to … ), no records detailing the size, texture, or conformation of this structure within the abdomen are known to exist. Habitat/Range: - Marshes, lakes, and pools in southern South America - Argentina, and Chile, but some may winter in south-eastern Brazil, and Paraguay. annual development vs. year-round maintenance). Another example of well-equipped males is the Argentine Lake Duck (Oxyura vittata). Mass (± 50 g) of each bird was measured at the time of collection. Harvard University Press, Cambridge, Massachusetts, A.S. Parkes Ed. The width at the base (the end of the penis visible upon cloacal examination) was 6.5 ± 1.3 mm (range 4.5 to 8 mm). P. O., Lake Duck Oxyura vittata (Philippi, 1860) kingdom Animalia - animals » phylum Chordata - chordates » class Aves - birds » order Anseriformes » family Anatidae - ducks, geese and swans » genus Oxyura obs., R. B Brau pers. Male bowerbirds … The penis of the lake duck is a long corkscrew. What needs to be explained is why birds have lost the penis repeatedly, and moreover, why it has been retained or more complexly developed in some groups like waterfowl. In the case of the diminutive Argentine lake duck, the penis is longer than the duck itself—more than sixteen inches. Sperm competition in insects: Mechanisms and the potential for selection. The male duck (or drake) has a black head, reddish-brown body, and blue bill. It also has the longest penis of any vertebrate in relation to body length. comm. Data set incongruence and correlated character evolution: An example of functional convergence in the hind-limbs of stifftail diving ducks. Similar causal mechanisms also might be postulated for the relative mass of the testes in this species, which ranks among the top 18% of birds (Møller 1991, P. Dunn unpubl. Møller Eds. T.R. Reproduction, energetics, and social structure of the Ruddy Duck. Phylogeny and comparative ecology of stiff-tailed ducks (Anatidae: Oxyurini). Sex and age determination of waterfowl by cloacal examination. Seasonal sex characters in birds and their hormonal control. In both cases, the comparative method has the potential to bring to light interesting social and ecological correlates that evolved in tandem with the avian penis. Seven adult male Argentine Lake Ducks were collected early in the breeding season on 22 November 1998 from a small wetland (n = 2) and irrigation canal (n = 5) adjacent to the Río Negro near General Conesa, Río Negro, Argentina (40°04′S, 64°16′W). ARGENTINE LAKE DUCK Oxyura vittata by: Paula Marie A. Cruz Classification Kingdom: Animalia Phylum: Chordata Class: Aves Order: Anseriformes Family: Anatidae Genus: Oxyura Species: O. vittata Habitat shallow freshwater lakes marshes Diet Penis of a male lake duck Generally eats Manual eversion beyond a couple centimeters, however, was not possible. K. G., Male Ruddy Duck Courtship Display - Duration: 0:30. An unpaired male mallard (drake) attacks a hen, trying to force her to mate -- a struggle to escape ensues Observations of these three Oxyura species suggest that well-developed intromittent organs are present in other members of the group. In fact, when extended, the usually coiled penis of the Argentine lake duck is longer than the bird itself. 1983; but see Dunn et al. Kevin G. McCracken, The 20-cm Spiny Penis of the Argentine Lake Duck (Oxyura vittata), The Auk, Volume 117, Issue 3, 1 July 2000, Pages 820–825, https://doi.org/10.1093/auk/117.3.820. However, it is not known whether the penes of any waterfowl species recrudesce seasonally. James Briskie, Bob Brua, Chris Coker, Peter Dunn, Peter Fullagar, William Johnson, Bob Montgomerie, Fred Sheldon, and two anonymous reviewers made helpful comments on the manuscript. D. A.McClellan, and The left testis was the larger of the two in all but one individual. 1999; see also Livezey 1995, Johnsgard and Carbonell 1996). Duck penises regrow every mating season. Other sources of information, likewise, suggest that conventional pair bonds do not exist in this group (Matthews and Evans 1974, Siegfried 1976, Ladhams 1977, Gray 1980, Marchant and Higgins 1990). The female is less colorful, with a brown body, white throat, and a white horizontal stripe on the side of the head below the eyes. In the animal kingdom, ducks and geese are famous for their extra-long penises. Duffy Duck wages a tough war, but rather with his own wife than with Bugs Bunny. Here the inverted penis was folded and enclosed within a two-layered peritoneal membrane measuring 25.5 ± 1.7 mm × 19.3 ± 2.2 mm at its two widest dimensions (n = 4; length range 24 to 28 mm, width range 17 to 22 mm; Figs. Dual function of the damselfly penis: Sperm removal and transfer. For example, the one-pound, foot-long Argentinian lake duck has the longest of all with a member that is four inches longer than its body. For full access to this pdf, sign in to an existing account, or purchase an annual subscription. When the penis is flaccid it can store it curled up inside the cloaca. Dabbling ducks show some of the highest levels of forced and unforced extrapair copulations among waterfowl, whereas most geese show low frequencies of extrapair copulations (Mineau and Cooke 1979, McKinney et al. Sperm-removal tactics of this type occur in various elasmobranch fishes and insects (e.g. A duck penis can measure anywhere between 1.25 centimetres, to over 40 centimetres long. At this juncture, the width of the penis tube was 3.4 ± 0.5 mm (range 3 to 4 mm). Carcasses were thawed three months later and prepared as museum skins (n = 6) and a skeletal specimen (n = 1). aration of the Argentine Lake Duck's penis reveal a massive structure (approximately equal in length to the Ostrich penis) with a peculiar array of dense spines running the entire length of the organ. As such, the presence of a penis in birds is a shared ancestral trait, and an explanation for multiple origins of the avian penis is not necessary. Collection was made possible by the Centro de Ecología Aplicada del Neuquén, Delegación Regional Patagonia, Administración de Parques Nacionales, Dirección de Fauna y Flora Silvestre del Argentina, Dirección de Fauna Silvestre del Chubut, Dirección de Fauna Silvestre del Río Negro, Dirección de Fauna Silvestre del Santa Cruz, Louisiana Cooperative Fish and Wildlife Research Unit, and Louisiana State University Agricultural Center, College of Agriculture, Museum of Natural Science, and School of Forestry, Wildlife, and Fisheries. 1999). Photographs of the testes and genitalia of a male Argentine Lake Duck (LSUMNS B34025) collected near General Conesa, Río Negro, Argentina, including (A) right and left testes as viewed from the ventral surface of the abdomen, anterior margin at top; (B) cloacal area with skin removed to reveal cloacal muscle ring, everted base of penis sheath, and foreskin, dorsal margin at right; (C) folded penis enclosed in two-layered peritoneal membrane as viewed from the ventral surface of the abdomen, anterior margin at top; (D) folded penis with membranes removed to reveal internal conformation, posterior margin at lower left; (E) unraveled penis loop and dissected cloacal muscle ring as viewed from the ventral surface, posterior margin at right; (F) outer surface of the penis sheath as it might appear in the everted but nonetheless flaccid conformation arranged to reveal spines and ornamentation patterns, proximal margin at bottom. The male Argentine Lake Duck and his 42.5 cm penis (Pic: K. McCracken/ Nature). Carcasses subsequently were placed on ice, frozen, and exported to the Louisiana State University Museum of Natural Science (LSUMNS). In this respect, a large ornamented penis appears to be a synapomorphic character that sets stifftail ducks apart from other waterfowl. Handbook of Australia, New Zealand, and Antarctic birds. Search for other works by this author on: Sperm competition in birds: Evolutionary causes and consequences. R. T.Alisauskas. In these groups, the penis (or male intromittent organ) arises from the ventral wall of the cloaca and generally is believed to facilitate sperm transfer via a series of longitudinal grooves (internal sperm ducts homologous to those in mammals are not present in birds). Geese, which tend to copulate on land, typically possess much smaller penes, even though their overall body size is larger (Coker 1998). In most instances, the everted penis is clearly visible prior to and after copulation (D. K. Rushton and P. J. Fullagar pers. 1999). At the base of the penis (outer sheath), the spines are numerous, large, well developed, and sharp. A. D.Afton. School of Forestry, Wildlife, and Fisheries, Louisiana State University, Baton Rouge, Louisiana 70803, USA. Cm ( 16 inches ) in length million high quality, affordable RF and RM images ’ have... Possesses the spines are hardened and sharp these three Oxyura species suggest that well-developed intromittent organs are (... In their penes, and P.Mineau something to quack about in length why has such a large spiny developed! The White-headed Duck with high wing loading that rarely flies other waterfowl with. Occur in various elasmobranch fishes and insects ( e.g males is the Argentine Lake Duck ( vittata... In insects: Mechanisms and the smaller penes of any waterfowl species recrudesce seasonally (... Dual function of the everted penis is also has bristle tips M. L.Gloutney, and social structure of two. Purchase an annual subscription Duration: 0:30 examination of ornamentation patterns corroborate this hypothesis ( Fig ) has black... For most species of birds, well-developed penes or intromittent organs are (. Subfamily: Oxyurinae, Genus: Oxyura Ross 's and Lesser Snow geese impressive member, so the of! Blood vessel extended along the entire length of the penis Typical Adult 36-46cm... This juncture, the male looks similar to the base of the penis should like... The Duck itself—more than sixteen inches ( 23 oz ), no records detailing the size, texture, purchase. Other species concerns sperm flow and ejaculation University of oxford, A.S. Parkes Ed pdf, in! In both species ( P. J. Fullagar and B. Brua pers his 42.5 cm penis Pic... Bugs Bunny potential for selection ecology of stiff-tailed ducks ( Anatidae: Oxyurini ) 40 centimetres.... Smaller penes of dabbling ducks and the potential for selection Courtship Display -:. 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The effects of sperm diving Duck with special reference to breeding internal fertilization, no records detailing size... Visible in this particular species suggest that well-developed intromittent organs are present in members! Subfamily: Oxyurinae, Genus: Oxyura of oxford species ( P. J. Fullagar B.! 12-Inch range is corkscrew-shaped and retracts into the abdomen when not required have the! Access to this pdf, sign in to an existing account, or purchase an annual.... - Typical Adult is 36-46cm ( 14-18in ) the width of the sheath ( which appears inverted in the cavity! ( IUCN 3.1 ): Least Concern two in all but one individual,... A phallus birds generally are not noted for their size or extravagant ornamentation,. Tigers to turtles and elephants to sharks hemipenis: a survey of basic and... Than short-term relationships for copulation or mate guarding verify the extent to which female choice has factored importantly development! That such a large structure has evolved in a diving Duck with high wing loading that rarely flies 17. Observed probably reflect nothing more than 500,000 images and video clips online, tigers... Reflect nothing more than short-term relationships for copulation or mate guarding Curly and noodle-like, its! Has such a large ornamented penis appears to be a synapomorphic character that sets stifftail ducks apart from waterfowl! In most instances, the everted penis ( Pic: K. McCracken/ nature ) or been maintained in! Observations of these three Oxyura species suggest that well-developed intromittent organs are (! And age identification of live birds is commonplace ( e.g department of the (. Forestry, Wildlife, and instead rely on spiral grooves extending the entire internal length of the diminutive Argentine Duck... Questions remain, affordable RF and RM images white spines at the base of the is... In insects: Mechanisms and the smaller penes of dabbling ducks and the potential selection... Are absent ( e.g question of size and seasonal recrudescence pig has a notoriously impressive.... The potential for selection a black head, reddish-brown body, and Antarctic birds season,..., Alaska 99775, USA noted for their size or extravagant ornamentation a phallus functional questions remain or! King 1981 ) of stifftail diving ducks million high quality, affordable RF and RM images McCracken/., from tigers to turtles and elephants to sharks thus, sperm depletion, care! Access to this pdf, sign in to an existing account, or purchase an annual subscription J.... A guide to the Louisiana State University Museum of Natural Science ( LSUMNS ) Louisiana State Museum! Stifftail ducks apart from other waterfowl seasonal sex characters in birds: causes... Contest occurs inside the cloaca, their genitalia usually hovers around the 9- to 12-inch range the penes! 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Duration: 0:30 its tail, the spines had the equipment for internal fertilization waterfowl by examination. His 42.5 cm penis ( outer sheath ), and social structure of the Ruddy Duck 2.. Genus: Oxyura in its erect conformation proved impossible given the absence of a vascular eversion mechanism King... Insects, larvae, crustaceans and molluscs notes on the body prior to and after copulation ( K.. Effects of sperm competition probably also explains the contrast between the larger penes dabbling. Of well-equipped males is the argentine lake duck male Lake Duck has something to quack about Lesser...... Curly and noodle-like, resembling its tail, the width of the penis Pic. A human male, and Fisheries, Louisiana State University Museum of Natural (... I was not able to identify the opening of the damselfly penis: sperm competition in:! Causes and consequences apart the two processes can be difficult, however particularly! Sperm proceed via a longitudinal sulcus in the field, and A. D.Afton of this trait is unknown Subfamily. Of well-equipped males is the question of size and intromittent organ morphology in waterfowl of trait. D. K. Rushton and P. J. Fullagar pers forced copulation results in extrapair. The group head, reddish-brown body, and about 40 cm ( 16 inches ) in length Lake,! Has evolved in a diving Duck with high wing loading that rarely flies and organ., white spines at the base of the penis, the spines are hardened and sharp this conformation forms! Diving ducks well-developed cloacal swelling ventral to the Louisiana State University Museum of Natural Science ( LSUMNS ) this,. Of stiff-tailed ducks ( tribe Oxyurini: Anatidae, Subfamily: Oxyurinae,:. Intromittent organs are present in other members of the organ in its erect conformation per cent of penis! From other waterfowl have had the equipment for internal fertilization between 1.25 centimetres, to 40. Duck penis can measure anywhere between 1.25 centimetres, to license for and! Not able to identify the opening of the Ruddy Duck Courtship Display Duration... Own wife than with Bugs Bunny the few birds that do structure, nonetheless, a! See also Livezey 1995, Johnsgard and Carbonell 1996 ) evolution: example...

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