http://www.bbc.com/news/science-environment-33510288
It is obvious now that the chickens are dinosaurs: http://www.kent.ac.uk/news/science/3384/chickens-closer-to-dinosaurs-than-other-birds
Also , a comparison of the amino-acid sequence from the T. rex collagen to a database of existing sequences from modern species showed it shared a remarkable similarity to that of chickens. Amino acids are the molecular building blocks of proteins; there are 20 of them used by organisms to build proteins, and their precise order is determined by instructions found in DNA.
This finding supports the idea that chickens and T. rex share an evolutionary link and bolsters previous research showing that birds evolved from dinosaurs and that birds are living dinosaurs.
(From the http://www.livescience.com/1410-rex-related-chickens.html)
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