exaptation1

chill, in the way of, exaptatoning : Exaptation and the related term co-option describe a shift in the function of a trait during evolution. For example, a trait can evolve because it served one particular function, but subsequently it may come to serve another. Exaptations are common in both anatomy and behaviour.

Cool and interesting sounds... and once again I learn a new word... Definitely listening to 2 now!