Human (Homo sapiens), adult male. Photo © Dan Savage · Wikimedia Commons · CC BY-SA 3.0
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The adult female human has eyeballs some ten per cent greater in volume, relative to brain volume, than those of the adult male.
This presumably reflects the additional vigilance needed by our women in view of their limited muscular mass and their crucial role in protecting children.
Robin and the Honey Badger, 22 March 2016
Human (Homo sapiens), adult female. Photo © saveliseb