Navigation Links
Female Ducks Develop Complicated Genitals to Outwit Aggressive Males

Rape is a monstrous violation of a woman's freedom. But in a patriarchal society with lopsided values, there seems to be no escape from it//. But ducks seem to show a way out.

Females in certain species have developed complicated genitals that frustrate aggressive male ducks, scientists have found.

A team of biologists at Yale University in Connecticut and the University of Sheffield in Britain stumbled upon the astounding biological answer to rape when they were trying to figure out why some species of birds had penises and some did not.

"Birds are the only group where it mostly has been lost -- 97 percent of birds do not have phalluses at all," Patricia Brennan said in a telephone interview.

"So if it is such a handy tool, why don't they have them any more?" Brennan asked.

Instead, they mate using what biologists call a "cloacal kiss" -- a brief touch of the single opening that birds of both sexes have for disposing of waste and that both eggs and sperm come out of.

Brennan noted that in many species, females choose a mate after he puts on an elaborate courtship display, and breeding pairs are often monogamous.

An exception is ducks -- especially mallards. Although mallards pair off to mate, females are often raped by stray males.

Still the ducklings born of consensual sex seem to be the norm. That was puzzling and so Brennan's team looked at a lot of duck bottoms.

What they found surprised them -- corkscrew-shaped oviducts, with plenty of potential dead-ends.

"Interestingly, the male phallus is also a spiral, but it twists in the opposite, counterclockwise, direction," said Yale ornithologist Richard Prum in a statement.

"So, the twists in the oviduct appear designed to exclude the opposing twists of the male phallus. It's an exquisite anti-lock-and-key system."

Brennan believes females evolved convoluted oviducts to foil the male rapists. Dr.
'"/>




Page: 1 2

Related medicine news :

1. Vitamin E supports Female Hearts
2. Genetic differences found between Male and Female brains
3. Female Smokers More Prone To Lung Cancer
4. The Success Rate Of Angioplasty In Female Patients Low
5. FDA Diminish Hopes On ‘Female Viagra
6. Have You Ever Wondered Why Male And Female Voices Differ?
7. Female Twins Have More To Share Than Just The Similarity: Risk Of Early Menopause
8. Hepatitis B A high cause of Asian Female Mortality
9. Female Condoms In The Offing
10. Sexual Harassment A Cause Of Deteriorating Health Among Female Flight Attendants.
11. The Chemistry Of Sexual Attraction Between Male And Female Elephants
Post Your Comments:
(Date:7/7/2015)... ... ... Ticket Down is a reputable source of authentic tickets for the 2015 CONCACAF Gold Cup ... at the Toyota Stadium. , The 2015 CONCACAF Gold Cup is now upon us ... held on American soil, will kick off in Frisco, CA from the Toyota Stadium and ...
(Date:7/7/2015)... ... , ... The United States Centers for Disease Control and Prevention have awarded ... Multicultural AIDS Coalition $3.78 million for a five-year HIV prevention partnership that will ... transgender women, the groups at highest risk of HIV infection in the US. ...
(Date:7/7/2015)... ... July 07, 2015 , ... ... group whose board is limited to permit holders. The Medical Cannabis Alliance of ... move the industry forward and are committed to making sure patients have access ...
(Date:7/7/2015)... , ... July 07, 2015 , ... Safe Catch is ... single fish for mercury. Albertsons, Gelson’s Markets, New Leaf Community Markets, Sprouts Farmers Market ... , “We developed the technology to test every fish for mercury,” said Safe Catch ...
(Date:7/7/2015)... ... 07, 2015 , ... On Saturday, May 16th, 2015, the Manistee, MI chapter ... Country Club. Best Drug Rehabilitation staff members were delighted to join in for this ... International, the parent of the Manistee Kiwanis Club, is a global organization that works ...
Breaking Medicine News(10 mins):Health News:Panama vs Haiti & USA vs Honduras CONCACAF Group A Tickets at Toyota Stadium: Ticket Down Slashes Ticket Prices for Haiti vs Panama & USA vs Honduras in Frisco/Dallas 2Health News:Panama vs Haiti & USA vs Honduras CONCACAF Group A Tickets at Toyota Stadium: Ticket Down Slashes Ticket Prices for Haiti vs Panama & USA vs Honduras in Frisco/Dallas 3Health News:CDC Awards Fenway Health, AIDS Action, Multicultural AIDS Coalition $3.78m For ‘Getting To Zero’ HIV Prevention Partnership 2Health News:CDC Awards Fenway Health, AIDS Action, Multicultural AIDS Coalition $3.78m For ‘Getting To Zero’ HIV Prevention Partnership 3Health News:Cannabis Growers and Dispensaries Form Medical Cannabis Alliance of Illinois 2Health News:Safe Catch Launches Tuna with Lowest Mercury Limit of Any Brand 2Health News:Best Drug Rehabilitation Team Participates in Kiwanis Club Golf Outing Fundraiser 2
... negative (benign) MRI-guided vacuum assisted breast biopsy may not be ... Yale New Haven Hospital in Connecticut, included 144 patients with ... 36 months. The study found no malignancies on follow-up ... of the study. Two patients had suspicious findings at follow-up ...
... HealthDay Reporter , THURSDAY, May 3 (HealthDay News) ... that regardless of how "full" a person may feel, ... overeating when tempted by yummy foods. The study ... eight participants, and the authors acknowledge that their findings ...
... be a primary cause of uncontrollable tumor growth in some ... authors, findings run counter to widely accepted beliefs that genetic ... or low oxygen levels in cells, is proven to be ... for curing the malignant growth could change in significant ways, ...
... Researchers at Albert Einstein College of Medicine of ... that levels of certain related proteins found in blood are associated ... up to a decade or more later. The findings, published ... a new front in the war against diabetes. These ...
... HealthDay Reporter , THURSDAY, May 3 (HealthDay News) -- When ... inflammation, and during the first 10 years with the disease ... kidney problems. Because kidney inflammation (also called lupus nephritis) ... of Rheumatology has issued new guidelines for the screening and ...
... presentations that will be given by researchers from ... American Psychiatric Association (APA) annual meeting in Philadelphia ... Lawrence C. Kolb Professor and chairman of the ... and NewYork-Presbyterian Hospital/Columbia and director of the New ...
Cached Medicine News:Health News:Why You Overeat Even When You're Full 2Health News:Why You Overeat Even When You're Full 3Health News:Low oxygen levels could drive cancer growth 2Health News:Low oxygen levels could drive cancer growth 3Health News:Study identifies possible protective blood factors against Type 2 diabetes 2Health News:New Guidelines Issued for Severe Lupus 2Health News:New Guidelines Issued for Severe Lupus 3Health News:Columbia University Medical Center and NY-Presbyterian experts at APA meeting 2Health News:Columbia University Medical Center and NY-Presbyterian experts at APA meeting 3
(Date:7/7/2015)... , July 7, 2015   ICD-10 Charts ... months of development, it has officially launched its ... Charts Training Academy and the new 4 Step ... well as all other ICD-10 Charts resources and ... in America, completely free-of-charge.  With the release of ...
(Date:7/7/2015)... 2015 Research and ... the "Elemental Analysis Market by Type (Organic, ... Application (Life Sciences, Food and Beverage Testing, Environment ... report to their offering. The ... types, technologies, and applications. By type, the market ...
(Date:7/7/2015)... and FREMONT, Calif. , July 7, ... South Korea and Velos, Inc. have entered into ... eResearch for cancer research nationally throughout South Korea ... The recent agreement signing was accompanied by a two day ... , South Korea.  National Cancer Center President ...
Breaking Medicine Technology:ICD-10 Charts Releases Revolutionary Free Solution for Complete ICD-10 Preparation 2ICD-10 Charts Releases Revolutionary Free Solution for Complete ICD-10 Preparation 3ICD-10 Charts Releases Revolutionary Free Solution for Complete ICD-10 Preparation 4Elemental Analysis (Organic, Inorganic) Market 2015 - Analysis & Global Forecasts to 2020 2National Cancer Center of South Korea and Velos Sign Long-Term Velos eResearch Agreement 2National Cancer Center of South Korea and Velos Sign Long-Term Velos eResearch Agreement 3
... Oct. 6 According to Millennium Research Group ... intelligence, growth in the $2 billion US cardiac ... the expanded approval of Boston Scientific,s chronic resynchronization ... I and II patients. The New ...
... Oct. 6 e-MDs, an industry leader in ... (EHRs) and practice management (PM) solutions,  congratulates  the ... Family Medicine of Fort Collins, CO, for their ... of Excellence recipients.  The Healthcare Information and Management ...
Cached Medicine Technology:Positive Results From the MADIT-CRT Trial Support the Expanding Approval of Cardiac Resynchronization Therapy Defibrillators 2Positive Results From the MADIT-CRT Trial Support the Expanding Approval of Cardiac Resynchronization Therapy Defibrillators 3e-MDs Clients Win HIMSS Davies Awards of Excellence 2e-MDs Clients Win HIMSS Davies Awards of Excellence 3e-MDs Clients Win HIMSS Davies Awards of Excellence 4
The 920M PLUS handheld pulseoximeter provides on-the-spot bloodoximetry and heart rate readings....
Rad-5 signal extraction pulse oximeter™...
... 3100 is a small, lightweight ... worn comfortably on the patients ... activities and for overnight studies, ... WristOx is intended to give ...
The pocket-size Invacare Digit finger pulse oximeter is a convenient and economical solution to fast, reliable SpO2, pulse rate and pulse strength measurements. Its compact size is ideal for home use...
Medicine Products: