Ja. Mather, HOME CHOICE AND MODIFICATION BY JUVENILE OCTOPUS-VULGARIS (MOLLUSCA, CEPHALOPODA) - SPECIALIZED INTELLIGENCE AND TOOL USE, Journal of zoology, 233, 1994, pp. 359-368
Analysis of 'homes' occupied by juvenile Octopus vulgaris shows flexib
le behaviour which may indicate specialized intelligence and tool use.
Octopuses occupied sheltered areas for a short time, average 10 days,
but stayed longer in larger homes and in areas where preferred prey w
as available. They did not simply respond to perceptual characteristic
s of a site, but instead chose locations potentially suitable and modi
fied them by removing rocks and sand and bringing in items partially t
o block the aperture.