Thomas Marent / Green Tree Python (Chondropython viridis) close up of face showing vertical pupil and row of heat sensors, Lae, Papua New Guinea
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Niall Benvie / Close-up of human girl's eye with pupil dilated
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Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas), the golden webbed skin is a nictitating membrane, part of the eye lid and enables the frog to see without giving up its camouflage
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Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) detail of eye, Soberania National Park, Panama
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Michael Durham / Human (Homo sapiens) detail of a nine year old boy's eye
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Michael Durham / Allen's Swamp Monkey (Allenopithecus nigroviridis) detail of eyes, native to Africa