Ocular pigmentation in humans, great apes, and gibbons is not suggestive of communicative functions - having an eye on the 'cooperative eye hypothesis'
K. R. Caspar, M. Biggemann, T. Geissmann, S. Begall
This study compares ocular pigmentation in hominoids, finding no support for the cooperative eye hypothesis and suggesting gradual genetic changes rather than adaptive communication functions.
bioRxiv · Mar 18, 2021Zoology