Like the males of 97 percent of all bird species, a rooster does not have a penis. The rooster injects sperm into a hen by pressing his vent against hers in a process known as the cloacal kiss. To transfer semen into a hen, the two cloacal papillae serve as the rooster’s mating.
The case of the missing bird penis is a long-standing mystery in evolutionary biology. But the identification of a molecular mechanism that.
If you've never seen a duck penis before, have a look at the infamous By comparing the embryos of a Pekin duck and a domestic chicken.
Researchers have long wondered why evolution robbed many bird species -- like the chicken -- of a piece of anatomy considered pretty key in.
The creep, who Faye thinks got her number from Facebook, texted her out of the blue with the X-rated snap adding: "Hey girl you so sexy.".