Biologist Mark Norman found octopuses (octopi?) off the coast of Indonesia that use split open coconut shells as hiding places. This is the first known tool use by an invertebrate animal:
An octopus would dig up the two halves of a coconut shell, then use them as protective shielding when stopping in exposed areas or when resting in sediment.
This, on its own, astonished the team. Then they noticed that the octopuses, after using the coconut shells, would arrange them neatly below the centers of their bodies and "walk" around with the shells—awkwardly.
It's uncertain whether these were African or European coconuts. Video at the link.
Link | Photo: Roger Steene