The proto-chicken is thought to have been a transitional bird species that evolved from a group of theropod dinosaurs during the late Cretaceous period, around 75 million years ago. This species gradually developed the traits that we now associate with modern chickens, such as feathers and beaks, and eventually gave rise to the domesticated chicken breeds that we know today. So the proto-chicken is an evolutionary ancestor of the chicken, rather than a separate species in its own right.
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