A similar interesting octopus story not mentioned in the article:
A particular light in a German aquarium kept short-circuiting and no one could figure out why. Using camera surveillance it was finally discovered that every night, the octopus would climb to the edge of his tank and shoot a jet of water on the light, shorting it. It was speculated that the light had been bothering the octopus' nocturnal routine.
http://www.telegraph.co.uk/news/newstopics/howaboutthat/3328...