Fig. 2 Intensity and polarization images of two black-headed gulls (Chroicocephalus ridibundus) viewed against a clear sky. Intensity and polarization.

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Fig. 2 Intensity and polarization images of two black-headed gulls (Chroicocephalus ridibundus) viewed against a clear sky. Intensity and polarization images of two black-headed gulls (Chroicocephalus ridibundus) viewed against a clear sky. (A) Original intensity and polarization images and (B) the same images showing the visual features that are resolvable by the crabs at increasing viewing distance based on the visual resolution of the region of the eye in Gelasimus vomeris [formerly Uca vomeris (20)] viewing approximately 15° to 20° above the horizon (45, 46). The polarization information is presented as a receptor activity ratio, i.e., the relative opponent output of the horizontally (H = 1) and vertically (V = −1) oriented photoreceptor channels calculated using a visual model (7). Note how the intensity contrast of a predator can vary depending on the animal’s coloration and illumination, but the polarization contrast remains the same. The Supplementary Materials provide the details on the polarization video camera used to capture these images. Photo credit: Sam Smithers, University of Bristol. Samuel P. Smithers et al. Sci Adv 2019;5:eaax3572 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).