In addition to camouflaging themselves during daylight hours, Sepia apama uses adaptable night camouflage to conceal itself from nightime predators; animals in spawning aggregations have been shown to cease sexual signaling behaviors and become sessile and camouflaged during the night. Remarkably, the camouflaged body patterns at night are tailored to each microhabitat that the animal might rest in, providing evidence that their night vision is excellent and that night predators also have keen vision.

References

Hanlon, R. T., M. J. Naud, J. W. Forsythe, K. Hall, A. C. Watson, and J. McKechnie. 2007. Adaptable night camouflage by cuttlefish. Am Nat 169: 543-551

EurekAlert! Stealth camouflage at night