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 r
'"/>




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:8/28/2015)... ... 28, 2015 , ... CARF International announced that West Ridge ... treatment and intensive family based services. , By pursuing and achieving accreditation, West ... of excellence. As a nonprofit charity for more than 50 years, West Ridge ...
(Date:8/28/2015)... ... , ... Northridge dentists Dr. Elyson and Dr. Assili are now ... currently receive a one hour treatment of this teeth whitening option. Zoom whitening ... of unique features that can turn teeth up to nine shades whiter. Effective on ...
(Date:8/28/2015)... Va. (PRWEB) , ... August 28, 2015 , ... ... , which is dedicated to distributing health information technology innovation to transform quality ... survey. Results of the survey will be de-identified and aggregated before being publicly ...
(Date:8/28/2015)... , ... August 28, 2015 , ... ... of the top 5 millionaire dating sites . According to the listings, ... the second best in this category. , A spokesperson of Top5MillionaireDatingSites.com ...
(Date:8/28/2015)... ... August 28, 2015 , ... A complimentary webinar offered by healthcare consulting ... Services’ (CMS) proposal to mandate bundled payments through the Comprehensive Care for ... Game Day: Comprehensive Care for Joint Replacement,” takes place at 12 noon EDT on ...
Breaking Medicine News(10 mins):Health News:West Ridge Academy Awarded CARF Three-Year Accrediation 2Health News:Northridge Dentists Dr. Elyson and Dr. Assili Now Offer a Special Promotion on Zoom Teeth Whitening 2Health News:WEDI's The Sullivan Institute for Healthcare Innovation Releases Gaps in Care Survey 2Health News:Top5MillionaireDatingSites.com Publishes Its First List of Reviews of the Best Millionaire Dating Sites 2Health News:PYA Offers Complimentary CCJR Webina — Game On 2Health News:PYA Offers Complimentary CCJR Webina — Game On 3
... scientists suggests a safer way to treat medulloblastoma, a ... found that one of the brains signaling pathways inhibits ... , The researchers discovered that three proteins, designated BMP2, ... and induced the malignant cells to develop into normal ...
... Orlando, Fla., is,known for theme parks and sun, but ... Turkey, and Italy will come to,Orlando for a different ... to learn the latest about robotic surgery., This ... at Florida Hospital, and led by the world,s leaders ...
... testing of all imported heparin , , FRIDAY, March 14 ... which has been linked to hundreds of allergic reactions and ... to a Chinese plant that processed raw ingredients for the ... the U.S. Food and Drug Administration said it will start ...
... Bedford, Mass. has developed a way of examining brain ... disease. , In the March 15 issue of ... of America, the team describes how they used optical ... and correctly identified which samples came from people who ...
... 14 MedQuist Inc.,(Pink Sheets: MEDQ.PK). On March ... with the individual named plaintiffs and certain,other putative ... Broward customer class action. As previously announced, on ... against the company and certain,present and former officers ...
... used insulin fared worse than white counterparts , , FRIDAY, ... with insulin-treated diabetes are less likely to monitor their ... , The researchers examined data on 16,630 Hispanic, black ... diabetes to come to this conclusion. , At every ...
Cached Medicine News:Health News:St. Jude finds signaling system that halts the growth of a childhood brain cancer 2Health News:St. Jude finds signaling system that halts the growth of a childhood brain cancer 3Health News:Robotic Surgeons From Around the World Attend One-of-a-Kind Conference by Global Robotics Institute at Florida Hospital 2Health News:Blood-Thinner Contaminant Traced to Chinese Plant 2Health News:Blood-Thinner Contaminant Traced to Chinese Plant 3Health News:Researchers use light to detect Alzheimer's 2Health News:Researchers use light to detect Alzheimer's 3Health News:MedQuist Announces Entry Into Settlement Term Sheet Resolving South Broward Litigation 2Health News:MedQuist Announces Entry Into Settlement Term Sheet Resolving South Broward Litigation 3Health News:Minorities, Poor Have Tougher Time Monitoring Diabetes 2
(Date:8/28/2015)... , August 28, 2015 The report "Eubiotics ... (Pork/Swine, Poultry, Ruminant, and Aquaculture), & by Region ( ... Asia-Pacific , and Rest of the World) - ... global market for Eubiotics was valued at USD 4.62 Billion ... by 2020, at a CAGR of 7.4% from 2015 to ...
(Date:8/28/2015)... -- The global mHealth market ... 2020, growing at a CAGR of 47.6% from 2013 ... View Research, Inc. Monitoring services is expected to grow ... 2020.      (Logo: http://photos.prnewswire.com/prnh/20150105/723757 ) , ... of chronic diseases such as cancer, heart ailments, and ...
(Date:8/27/2015)... Aug. 27, 2015 DURECT Corporation (Nasdaq: ... present at three upcoming healthcare conferences.  ... will present at the Rodman & Renshaw Investment Conference ... The conference is being held at the St. Regis ... A live audio webcast of the presentation will be ...
Breaking Medicine Technology:Eubiotics Market Worth 7.05 Billion USD by 2020 2Eubiotics Market Worth 7.05 Billion USD by 2020 3Eubiotics Market Worth 7.05 Billion USD by 2020 4Eubiotics Market Worth 7.05 Billion USD by 2020 5mHealth Market is Expected to Reach $49.12 Billion By 2020: Grand View Research, Inc. 2mHealth Market is Expected to Reach $49.12 Billion By 2020: Grand View Research, Inc. 3mHealth Market is Expected to Reach $49.12 Billion By 2020: Grand View Research, Inc. 4mHealth Market is Expected to Reach $49.12 Billion By 2020: Grand View Research, Inc. 5DURECT to Participate in Upcoming Healthcare Conferences 2
... 1 Dr. Walter Cottrell,Pennsylvania Game Commission wildlife ... adult female deer has confirmed that epizootic,hemorrhagic disease ... Other counties in which EHD has been ... Washington; and Westmoreland.,EHD also was confirmed in farmed ...
... myeloma is one,of the most common and devastating bone ... dramatically over the past decade. Recent,analyses suggest that this ... aggressive therapeutic interventions such as stem cell transplantation,according to ... the,official journal of the American Society of Hematology., ...
Cached Medicine Technology:Game Commission Announces EHD Confirmed in Fayette County 2Game Commission Announces EHD Confirmed in Fayette County 3Game Commission Announces EHD Confirmed in Fayette County 4Studies Attribute Recent Increase in Multiple Myeloma Survival to Novel Therapies 2Studies Attribute Recent Increase in Multiple Myeloma Survival to Novel Therapies 3Studies Attribute Recent Increase in Multiple Myeloma Survival to Novel Therapies 4
... System is the newest real-time PCR instrument ... instrument offers six detection channels that provide ... 670, and 710nm. Perform rapid PCR due ... working with glass capillaries. Virtually any published ...
... detection of SYBR Green I or FAM ... of fluorophores in the second channel ... for a multitude of applications such as ... cycler offers precision thermal control and a ...
Mx3000P instrument, notebook computer, Mx3000P software package, user's manual, one Brilliant QPCR Reagent of your choice, and custom filter wheel with 4 filters chosen from: FAM/SYBR Green I, TET, H...
Mx3000P instrument, notebook computer, Mx3000P software package, user's manual, one Brilliant QPCR Reagent of your choice, and custom filter wheel with 4 filters chosen from: FAM/SYBR Green I, TET, H...
Medicine Products: