Shells found around the dens ofOctopus dofleiniwere examined for indications of handling methods used by the predators. The octopus attacks gastropod and bivalve prey by drilling, breaking and pulling apart. The size of the prey does not seem to determine the method of attack and the size of the predator also did not seem to be a significant determinant although small octopuses drilled more often than expected. The method of attack appears to be dependent on the nature of the shell and likely on the previous experience of the octopus.