Footballing Dolphins?

I note that my comments on the Pembrokeshire dolphins 'playing football' with jellyfish were reported by the Western Mail (http://www.walesonline.co.uk/news/wales-news/2009/10/17/jellyfish-pay-the-penalty-in-ocean-version-of-football-91466-24949850/). I suppose that I ought to have added that such play may serve a valuable function in these animals enabling the participants to explore their physical and sensory capabilities. One could even image the cetaceans using the technique to deal with some fish species or potential dangers.