The calcareous, oval-shaped internal shell of a cuttlefish (order Sepiida), originally used in powdered form as an antacid and for absorbing moisture or polishing objects, and now chiefly as a dietary supplement for cage birds.

A brightly-coloured species of cuttlefish, Metasepia pfefferi, found in tropical Indo-Pacific waters.

The common cuttlefish or European common cuttlefish (Sepia officinalis) is one of the largest and best-known cuttlefish species.

The giant cuttlefish (Sepia apama), also known as the Australian giant cuttlefish, is the world's largest cuttlefish species, growing to in mantle length and up to in total length (total length meaning the whole length of the body including outstretched tentacles).

The pharaoh cuttlefish (Acanthosepion pharaonis) is a large cuttlefish species, growing to 42 cm in mantle length and 5 kg in weight.