Fig. 1.

Cephalopod behavior and pupil shapes. Figs. S1 and S2 and Movies S1 and S2 show additional examples. Many shallow water cephalopods produce colorful displays [(A) Australian giant cuttlefish Sepia apama] to conspecifics and accurately color-match natural environments to camouflage [(B and C) broadclub cuttlefish Sepia latimanus]. Their pupil shapes [(D) S. bandensis] maximize chromatic blur. Images courtesy of (A) Klaus Stiefel, (B) Flickr/Lakshmi Sawitri, (C) Ken Marks, and (D) Roy Caldwell.