Oh, sure, you all hear about the bold dominance displays of male cuttlefish, and their camouflage, and the flashing color changes, but this is a new one on me. The females have a unique display, that they only show to other females (or to themselves in a mirror).
Here it is an a drawing: elegant, understated, quite nice.
What I find disturbing is that they do not display this signal to any other males — it’s like a secret code for the lady cuttlefishes only. What are they communicating? Are they talking about me? Do they have secrets no male is permitted to discover?
I bet it’s for the cuttlefish whisper network.
M. E. Palmer, M. Richard Calvé, Shelley A. Adamo (2006) Response of female cuttlefish Sepia officinalis (Cephalopoda) to mirrors and conspecifics: evidence for signaling in female cuttlefish. Animal Cognition 9(2):151-155.