Octopuses Using Coconut Shells As Shelters
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...
https://www.neatorama.com/2009/12/14/octopuses-using-coconut-shells-as-shelters/