mollusk with foot presenting as multiple or .
Cephalopods include , , , , and the . The cephalopod are a kind of .
Most extant cephalopods possess either no or a reduced, internal shell (cuttlefish). Alternatively, the chambered nautiluses possess an external shell as too also the extinct ammonites.
The following videos are about octopusses and cuttlefish, respectively, but mostly are humorous.