 Deimatic behaviour is found in cephalopods including the common cuttlefish Sepia officinalis , squid such as the Caribbean reef squid ( Sepioteuthis sepioidea ) and bigfin reef squid ( Sepioteuthis lessoniana ) , octopuses including the common octopus Octopus vulgaris and the Atlantic white @-@ spotted octopus ( Octopus macropus ) , and the paper nautilus ( Argonauta <unk> ) . Deimatic cephalopod displays involve suddenly creating bold stripes , often reinforced by stretching out the animal 's arms , fins or web to make it look as big and threatening as possible . 
