Tag Archives: Chicken Reproduction

Do Roosters Have a Penis?

Do Roosters Have a Penis?

Like the males of 97 percent of all bird species, a rooster does not have a penis. An incubated egg that will become a rooster starts to develop a penis, but early in the second week of embryonic development, a cell death protein called Bmp4 cloaks the incipient penis, causing it to stop developing and… Continue Reading