Why Do Birds Have White And Dark Meat? (And Do We?)

Why do chickens and turkeys have white meat and dark meat? And, like, gross, but .. do humans have the same thing? It's all about our muscles: what they're made of, and what they're made for. Quick Questions has the answers!
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Sources:
http://ptjournal.apta.org/content/81/11/1810.long
http://college.holycross.edu/faculty/kprestwi/exphys/lecture/ExPhysEx1Lect_pdf/ExPhys_03_L09_Fiber_Type.pdf
http://www.loc.gov/rr/scitech/mysteries/turkeymeat.html
http://www.wisegeek.com/what-is-the-difference-between-white-meat-and-dark-meat.htm
http://hyperphysics.phy-astr.gsu.edu/hbase/biology/atp.html
http://www.elmhurst.edu/~chm/vchembook/547glycogen.html
http://www.bbc.co.uk/science/humanbody/body/factfiles/fastandslowtwitch/soleus.shtml

Видео Why Do Birds Have White And Dark Meat? (And Do We?) канала SciShow