Why Roosters Aren’t Endowed
A new study from the University of Florida in Gainesville has discovered why male chickens and other birds do not have a penis. Around 97 percent of bird species have little or no phallus, even though they reproduce through internal fertilization.
Although chickens have a penis in the embryonic stages of development, it regresses over the course of maturation because of a genetic program that causes cell death at the tip of the growing penis.
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