Eye Marks in Vertebrates: Aids to Vision

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Science  03 Sep 1971:
Vol. 173, Issue 4000, pp. 936-939
DOI: 10.1126/science.173.4000.936


Lines leading forward from the eye may function as aiming sights in many small vertebrates. The chief evidence is the correlation of distribution and positions of eye-lines in various vertebrate groups with predatory feeding habits. Dark patches around the eye may serve to reduce glare in species in bright environments. Facial patterns often have multiple functions.