Fish just want to have fun, according to a new study that finds even fish 'play'

I saw this on ScienceDaily:

Fish just want to have fun, according to a new study that finds even fish 'play'
http://www.sciencedaily.com/releases/2014/10/141020121406.htm

Biologists have documented fish playing with a bottom-weighted thermometer and other objects. Play, like much of animals' psychology including emotions, motivations, perceptions and intellect, is part of their evolutionary history and not just random, meaningless behavior.

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