A scientist trying to understand why Argentine lake ducks have foot-long spiral-shaped penises discovered that duck vaginas, which often have pockets and cul-de-sacs, spiral in the opposite direction; a comparison of sixteen duck species also revealed that as vaginas become longer and more complex, males evolve longer penises. | Harper's Magazine

Sign in to access Harper’s Magazine

Need to create a login? Want to change your email address or password? Forgot your password?

  1. Sign in to Customer Care using your account number or postal address.
  2. Select Email/Password Information.
  3. Enter your new information and click on Save My Changes.

Locked out of your account? Get help here.

Subscribers can find additional help here.

Not a subscriber? Subscribe today!

Get Access to Print and Digital for $23.99.
Subscribe for Full Access
Get Access to Print and Digital for $23.99.

A scientist trying to understand why Argentine lake ducks have foot-long spiral-shaped penises discovered that duck vaginas, which often have pockets and cul-de-sacs, spiral in the opposite direction; a comparison of sixteen duck species also revealed that as vaginas become longer and more complex, males evolve longer penises.

Adjust

A scientist trying to understand why Argentine lake ducks have foot-long spiral-shaped penises discovered that duck vaginas, which often have pockets and cul-de-sacs, spiral in the opposite direction; a comparison of sixteen duck species also revealed that as vaginas become longer and more complex, males evolve longer penises.

More from

More