an alligator has a tapetum lucidum at the back of each eye, which reflects light back into the photoreceptor cells to make the most of low light. the colour of eyeshine differs from species to species, but in alligators glows red. the length of the alligator can be approximated by judging the distance between the eyes, making this alligator very long.  photo by larry lynch

an alligator has a tapetum lucidum at the back of each eye, which reflects light back into the photoreceptor cells to make the most of low light. the colour of eyeshine differs from species to species, but in alligators glows red. the length of the alligator can be approximated by judging the distance between the eyes, making this alligator very long. photo by larry lynch

An alligator has a tapetum lucidum at the back of each eye, which reflects light back into the photoreceptor cells to make the most of low light. The color of eyeshine differs from species to species, but in alligators it glows red. The length of the alligator can be approximated by judging the distance between the eyes, making this alligator very long.

An alligator has a tapetum lucidum at the back of each eye, which reflects light back into the photoreceptor cells to make the most of low light. The color of eyeshine differs from species to species, but in alligators it glows red. The length of the alligator can be approximated by judging the distance between the eyes, making this alligator very long.

The tapetum lucidum of a northern greater galago, typical of prosimians, reflects the light of the photographers flash.

The tapetum lucidum of a northern greater galago, typical of prosimians, reflects the light of the photographers flash.

an alligator has a tapetum lucidum at the back of each eye, which reflects light back into the photoreceptor cells to make the most of low light. the colour of eyeshine differs from species to species, but in alligators glows red.

an alligator has a tapetum lucidum at the back of each eye, which reflects light back into the photoreceptor cells to make the most of low light. the colour of eyeshine differs from species to species, but in alligators glows red.

Photographer Suren Manvelyan's latest collection contains extreme close-up photos of various animal eyes, including humans, rabbits, lemurs, chimps, tigers and more taken at Yerevan Zoo in Armenia.

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