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Theropod means "beast footed". This was the beginning species of what are now commonly known as the chicken. Theropods were found all around North and South America. There weren't any adaptations for this species since it was the beginning for chickens.  An example of a Theropod is a ceratosaurus.

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More advanced species of Theropods. These species were one of the remaining Theropods to survive the Triassic-Jurassic extinction period. The species started to grow more hair than its previous ancestors. They were also found to live in the same places as its ancestors.

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Averostra dinosaurs are another species that branched off from Theropods. Averostra means "bird snout", which hints at the direction the species is going towards. These species are showing more feathers. The arms are getting shorter and shorter, starting to show features that the present day chicken has.

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Ornitholestes- 161.2- 145 Million Years Ago 

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Ornitholestes- 161.2- 145 Million Years Ago 

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Ornitholestes come from the same family of Theropods, but they are still different. The early Theropod was skinny without feathers or any bird-like features. Like Theropods, Ornitholestes lived in what is now known as North America. The only adaptation was its new feathery limbs instead of the claw/finger-like ones from before. The Pennibrachia suggests that the wings were originally used for mating purposes but only later used for flight. The wings still had the ojutstretched arms of the earlier Theropods.

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The Maniraptora species differed from the pre-existing species because of the difference in arm/wing structures. The arms became less and less needed as time went on so the arms started to get shorter in length, and wings started to take over. The wings were used as a mating process at first, but then later used for flight. The species were found in North and South America, just like its ancestors.

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scansoriopterygids- 140 Million Years Ago 

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scansoriopterygids- 140 Million Years Ago 

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The Scansoriopterygids species are an extinct Maniraptora. These species were known for climbing and gliding. The previous ancestors wings were more limb/finger like due to the need to grab things. As time went on that need became less and less important. This species was one of the results for that dwindling need. The limbs are more pronounced with present day bird-like features. This species were found in North America and South America, much like its previous ancestors.

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The Yixianosaurus species evolved from previous Maniraptoras. The limbs became shorter but kept its wing-like features. This was due to the dwindling demand of using limbs to pick up things and the increasing demand of mating processes and aviation. The species were found to live in Asia, specifically China. As time went on these birds were traded all over the world meaning that they could be found in different parts of the world, not just one place.

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The presently known chickens have been domesticated from a species called the Junglefowl. Researchers have found that Chickens have been domesticated from a Red Junglefowl subspecies called Gallus gallus after being transported. These species started to begin the domestication process around areas such as China. The tail had shorten its length from its previous ancestors. The long tail wasn't needed anymore because the species did not have a need to use the tail to fight bigger species because of the slow domestication it started to head towards.

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The Spadiceus is a subspieces of the main species, the Junglefowl. The only reason there is a difference/ evolution between the two species is because of the continued domestication and breeding of the Junglefowls so that the demand for more food could be met. The species could be found all over the world, due to trading.

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Chickens were domesticated and bred from its ancestors, the Junglefowl to meet the growing demand of food. These chickens were tradded all over the world except for Antarctica and the Vatican City. They were moved all over the world to meet the demand. Nothing really changed from its previous ancestors, the Spadiceus. After researching g the adaptations of the common chicken, I hypothesize the legs of the chicken will get stronger and bigger while the arms will stay the same so that the species can run faster due to needing to run away from bigger pray. This could be due to the domestication of the chicken, which was for the increasing demand of food.