Any of several large octopuses, especially the Pacific giant octopus (Enteroctopus dofleini), noted for their intelligence and ability to change colour.
Local fishermen tell tales of a huge devilfish that can unscrew the lids of their crab pots.
A manta ray or related large ray of the genera Manta or Mobula, having wing-like pectoral fins and a broad, flat body.
From the cliff we could see a lone devilfish gliding just below the surface.