![Rooster Portrait](https://www.cacklehatchery.com/wp-content/uploads/2019/04/Rooster-Portrait-150x150.jpg)
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 […]
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