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By the way, Martin Wells says, in Octopus: Physiology and Behaviour of an Advanced Invertebrate (Springer, 1978) that contrary to popular report, octopuses cannot learn to open jars:

Crabs can be wrested from containers (Pieron, 1911; Schiller, 1948; Cousteau and Diole, 1973) but the results appear to be achieved by chance and there is little indication that the octopus can learn to deal with the situation more efficiently with practice. The animal approaches and struggles with the apparatus until something happens; if it learns any-thing as a result of its experience it is only to be more persistent and vigorous.

(p. 241)

There may have been further developments since 1978, of course.