Gripping reason for wrinkly skin

The skin changes after being in water to improve grip on wet objects,
researchers from Newcastle University suggest.
The study compared the results of people taking objects out of water with and
without the prune-like skin formation.
Dr Tom Smulders, writing in Biology Letters, said: "Going back in time, this
wrinkling could have helped with gathering food [...]
Source:
http://www.ezonearticle.com/2013/01/09/gripping-reason-for-wrinkly-skin/