http://www.lrb.co.uk/v29/n20/jerry-fodor/why-pigs-dont-have-wings
notes =[]
Fitness was a metaphor for survival in Darwin's days:
http://en.wikipedia.org/wiki/What_Darwin_Got_Wrong
"....Because these traits come together, they are both correlated with fitness...."
rephrase:
Because these traits come together, they are both correlated with survival.
Which is a truism.