From National Geographic:
Octopus In A Bottle
Jeffrey de Guzman, Your Shot
A veined octopus uses a discarded bottle for shelter on the sea floor off the Philippines in a photo released in September.
Veined octopuses have been observed using coconut shells as tools. Researchers reported the animals digging up the two halves of a coconut shell, then using them as protective shielding when stopping in exposed areas or when resting in sediment.