Here is a video of them doing it: http://www.youtube.com/watch?v=wuVgXJ55G6Y&NR=1
It looks like simply a fun activity. Dolphins are known to have playful behavior, doing things that just can’t be explained to be of any other benefit. I guess these ones just got very bored at the zoo, with the limited space and absence of waves to surf and fish schools to hunt.
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