given that male and female emus are largely monomorphic. This provides a great system to understand how sex chromosomes evolve in their early phase -- and in the case of Pekin duck, in the middle ...

Females have long tubular vaginas, like this one (left) of a Pekin duck ... The female oviduct has many out-pockets or "dead ends" and is also spiraled—not an easy fit for a male duck.

She figures the male and female bird — with their snow white ... That’s until “their yard filled up with poop.” Pekin ducks are considered market poultry, meaning they’re raised for ...

We own a total of three ducks: two Pekin hens and one Khaki Campbell drake, or male duck. The Pekin duck originally came from China. It is a member of the Mallard family. The Pekin is best known ...

The patients were nine female pekins and three male pekins ... In other words, the khaki genes usurp the places of pekin genes in the pekin duck cells. But this simple explanation does not ...