Octopus is a tool user. It can use shells of sea snails, discarded coconut shells and such other things to build his nest. You can see one octopus living in a shell. Look at the creature in the photo number 18, it has built a rather complex house with multiple shells and a glass jar.
Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10