What does it mean if a snake has blue eyes?
Most blue-eyed snakes are the result of selective breeding for genetic mutations. The most popular snake with blue eyes is the blue-eyed leucistic ball python. Leucism is a mutation that removes almost all melanin, creating a pure white snake with blue eyes.
Final Phase
After around two to four days of being stuck in the blue phase, your snake's skin and eyes will begin returning to normal. Don't worry -- you didn't miss the shedding of his skin. He's simply entered the final phase before that old skin sloughs off.
The eyes start to look cloudy and blue about a day into the shedding process. This is a sign that liquid is building up between the eye and the eye cap, which is part of the snake's skin. This fluid helps separate the eye and eye cap so it can release easily.
A young, healthy, well-fed snake will shed more often (perhaps every month). Shedding begins with a subtle dulling of the skin color all over the body, followed in several days by the eyes turning a cloudy, blue/grey color. Next, the skin color brightens, and the eyes clear and resume their normal appearance.
Q: Why do snakes' 🐍 eyes turn cloudy? A: They're about to shed their skin! Before shedding, a snake's eyes cloud over. This is a result of a fluid build up between the old skin and the new, separating the layers and preparing the old skin to be able to come off.
Indications that your snake is about to shed usually include a loss of appetite, lack of interaction, spending time in its hide or water bowl, milky coloured eyes and dull skin. Ignore any Abnormalities. Most signs of illness will be visible on the snake's skin. Scales are fundamental to reptiles' every movement.
The blue phase of shedding lasts for 2 – 4 days and leads to the skin shed itself which takes around 10 minutes. The greyish blue color of your snake and the milky appearance of its eyes are caused by a lubricant that builds up between the top layer of skin and the new skin underneath.
The complete shedding process can take between one to two weeks. Whilst it can be tempting to intervene and help snakes shed, the best thing you can do is leave them be. Snakes become easily stressed when shedding, so avoid handling during this time and just visually check their progress.
Snakes that haven't eaten for a prolonged period of time (weeks to months) will appear dehydrated, with sunken eyes, retained pieces of skin from incomplete shedding and dry, sticky saliva in their mouths.
The smooth green snake turns blue after it dies. The reason for this is that the green in its body is made up of a combination of blue and yellow. After death the yellow pigment fades quickly, leaving only blue behind.
How long does it take a snake to shed once it starts?
A snake typically remains opaque for about 4 to 7 days after which the eyes become clear and actual shedding takes place 4 to 7 days after that. Snakes shed by rubbing their nose and face against objects in the cage.
If your snake is dehydrated, you may notice several symptoms, including cloudy and sunken eyes, weight loss, and a lack of appetite. if you're not sure whether your ball python is dehydrated, look for these signs: Sunken eyes. Dry and flaky skin.

When they enter the “blue phase,” their eyes will appear milky-blue due to a buildup of fluid. This clears up, and your ball python will shed its skin within 72 hours. We'll detail the ball python shedding cycle from start to finish.
During this time period, your ball python may be more secretive than normal. He'll often refuse food during this time, and he may be more defensive or nervous than usual. As shedding time approaches, you'll typically notice that your snake's eyes (and, to a lesser extent, his body skin) will clear up a bit.
Its eyes turn a cloudy, bluish color. This is due to a lubricant secreted underneath the outer layer of skin to assist with the shedding process. It becomes sort of a temporary filter over the eye, but just prior to shedding, the eyes should clear up again.
When snakes prepare to shed, their skins become loose, and fluid builds up between the old and new skins. Just before they shed, it is common for their eyes to become blue-gray or milky blue in color.
While humans “shed” millions of skin cells every day, snakes and other animals shed a layer of skin in one continuous piece, a process called ecdysis, which occurs between four and 12 times a year.
He is called "Chatterbox" but does not actually speak, because he had been dared by the other soldiers to actually keep quiet for a time. Snake Eyes is terribly scarred, and loses his voice, when a Cobra Commander-controlled Starscream shoots Cover Girl's missile tank out from under him.
No, snakes don't have eyelids, so they can't close their eyes (interestingly, they can't blink either). Instead, they have a brille on each eye, a layer of transparent scales that covers and protects the eyes. This means snakes sleep with their eyes open. Your snake might not get “shut-eye,” but they do sleep.
Snakes have poor eyesight compared to other reptiles, although they still see colour and ultraviolet light.
What triggers a snake to shed?
Put simply, snakes shed their skin because it doesn't fit anymore or because it's old or worn out. When snakes grow, their skin does not, so they outgrow it. When this happens, they shed their outer layer of skin.
There is not a specific time of year when all snakes molt. They can shed almost any time of year. Notably, young snakes shed their skin about once a week as they continue to grow and develop. In fact, the age of the reptile plays an important role in how often it sheds.
When they're ready to shed the old layer, they create a rip in the old skin, usually in the mouth or nose area. They often do this by rubbing against a rough, hard object, such as a rock or a log. Once the old skin layer has been breached, the snake inches its way through the old layer until it's completely removed.
Thus, if they soak in water, it should neither be too hot nor too cold. Fourth, a 10-minute soak is adequate for most reptiles, regardless of species. Longer than that may lead to wrinkly, excessively soft skin like we get when we stay in the tub too long.
Go get the snake, place it in the tub, and replace the lid. Then throw a towel over the top. The towel will help to make the snake feel secure and hidden. Leave the snake alone, in the box for 15-20 minutes.
Snakes can generally last around two months without food, however, wild snakes can go without fresh water for months or even weeks. Snakes in captivity shouldn't be restricted water intake for longer than a week.
To avoid making your snake feel stressed, you should gently scoop them out of their enclosure, placing one hand near their head and the other under their tail to try and support their whole body as much as possible. When you hold them, you should always be supporting their weight rather than clutching onto them.
Snakes need moisture to stay cool and hydrated during hot summer days. They're attracted to puddles, wet grass, sunken spots, and other stagnant water. Water like this also tends to attract rodents and insects, which snakes can eat.
General air temperatures in a ball python's enclosure should never exceed 95°F (35°C)!
“If you find a dead snake,” says the American College of Medical Toxicology, “do not come into contact with the snake's mouth, because dead snakes can still deliver venom through their fangs. Even a severed head of a snake still has the ability to inject venom when it is touched.”
What does a snake do before it dies?
Breathing issues are one of the major signs of a dying snake. You can come to know that if your snake is straining to breathe or is breathing by keeping its mouth open. Apart from these, you may also hear your snake gasping for air or wheezing loudly.
Because all the brightly coloured pigments live in the soft dermis, and not the scales, the colour mainly stays on the snake, not the part it sheds. But every so often, the shed skin can show dark brownish black stripes or blotches, because of melanin in the scales.
Healthy adult snakes shed their skin on a regular basis, typically around once a month, though this may vary according to breed. Due to variations in the growth process, younger snakes may shed their skin every two weeks, while older snakes may only slough a couple of times a year.
Snakes are able to grow when they shed their skins. The new skin is stretchable and allows for a larger body size than the previous skin. Younger snakes should shed more frequently as they are in a more rapid growth phase.
When snakes excrete waste, it is actually a mixture of feces and urine that looks white and is more of a liquid than a solid, much like bird droppings. The pests' waste may contain bones, hair, scales, and other indigestible materials leftover from meals.
According to the Moscow Zoo, the snakes are the blue variety of the white-lipped island pit viper - a venomous pit viper subspecies found in Indonesia and East Timor. Most white-lipped pit vipers are actually green, with the blue variety being quite rare.
Since the pair of pips looks just like a pair of eyes, the gamblers have associated it with snakes since they're considered to be a symbol of treachery and bad luck.
The blue-eyed anglehead lizard belongs to the Gonocephalus genus of lizards, a group of 16 species found throughout Southeast Asia. They're known for their big, broad heads, brightly coloured scales, and extravagant spines and crests.
Nocturnal snakes usually have slits (called elliptical pupils) for pupils, while diurnal snakes usually have round ones. Generally, snakes are known to have yellow eyes, but in reality, their eye color is largely determined by species, amongst other things.
Answer: I'd say you were correct the first time in thinking blue is the least common color in the herp world.
What ball pythons have blue eyes?
The blue eyed leucistic ball python is a treat for the eyes! Referred to by many in the hobby as BEL pythons, this snake isn't a distinct species. Instead, it's a rare morph of the standard ball python (Python regius). It doesn't take an expert to realize why these snakes are so sought-after!
The inland taipan (Oxyuranus microlepidotus) is considered the most venomous snake in the world with a murine LD 50 value of 0.025 mg/kg SC.
The Snake Eyes
They look like snake eyes individually, hence the term. The thing that happens once you roll snake eyes in a given game of craps depends on the casino's rules. However, we must mention that, in most cases, rolling snake eyes is disadvantageous to the player and will make them lose money.
A roll of two 1s (the lowest roll possible) on a pair of six-sided dice. The probability of rolling snake eyes is 1/36, or 2.777...
The researchers found that snakes that hunt during the day have lenses in their eyes that block ultraviolet light, allowing the reptile to see clearly in bright conditions. Species that hunt at night have the opposite: lenses that allow more UV light in, helping them to see in the dark.
It's all about the melanin, or the pigment in the iris, that makes up the colored part of the eye. Brown eyes, which are the most common color, have brown pigment in both the front and back layers of the iris. Blue eyes have a small amount of melanin (or none at all) in the front layer and a small amount in the back.
Indeed, most mammal, fish, reptile, amphibian, and bird blood is red because of hemoglobin, whose protein is made of hemes, or iron-containing molecules that fuse with oxygen.
Vipers, pythons and boas have holes on their faces called pit organs, which contain a membrane that can detect infrared radiation from warm bodies up to one metre away. At night, the pit organs allow snakes to 'see' an image of their predator or prey — as an infrared camera does — giving them a unique extra sense.
Examining a snake's pupils is another method that can be utilized to identify venomous versus non-venomous snakes. Like a cat's eye, venomous snakes have thin, black, vertical pupils surrounded by a yellow-green eyeball while non-venomous snakes have rounded pupils.
For example, red is a warning color for many animals, so snakes avoid it.
References
- https://a-z-animals.com/blog/do-snakes-have-emotions-how-can-you-tell/
- https://medium.com/natural-world/how-not-to-id-a-venomous-snake-8c7de2d0ca2e
- https://www.aarp.org/health/conditions-treatments/info-2022/rarest-eye-color.html
- https://animal-club.co.uk/do-pet-snakes-recognise-their-owners/
- https://theconversation.com/curious-kids-do-worms-have-blood-and-if-so-what-colour-is-it-147578
- https://www.iowadnr.gov/About-DNR/DNR-News-Releases/ArticleID/158/Why-Do-Snakes-Shed-Their-Skin
- https://en.wikipedia.org/wiki/Large-eyed_green_tree_snake
- https://www.australiangeographic.com.au/blogs/creatura-blog/2019/03/this-forest-dragon-has-the-most-incredible-blue-eyes/
- https://en.wikipedia.org/wiki/Storm_Shadow_(G.I._Joe)
- https://www.petmd.com/reptile/care/evr_rp_how-can-i-tell-if-my-snake-sick
- https://eyexam.com/6-rare-unique-eye-colors/
- https://naturallycuriouswithmaryholland.wordpress.com/2013/08/23/what-a-snakes-eyes-can-tell-you/
- https://goodcompanionsvets.co.uk/wp-content/plugins/vetstream_swagger/pet-health/pet/pet_info_print.php?vetstream-type=ZXhvdGlzL3JlcHRpbGVz&nodeguid=a707b301-ade1-4c4d-b197-abce2d2ebc62
- https://www.reptileadvisor.com/ball-python-shedding/
- https://hgic.clemson.edu/factsheet/identifying-copperhead-snakes/
- https://www.stonecreekhounds.com/post/what-is-the-best-material-for-snake-chaps
- https://www.facebook.com/NatureCenter/photos/a.10152082600287214/10159631588017214/?type=3
- https://www.pbspettravel.co.uk/blog/what-should-i-do-when-my-snake-is-shedding/
- https://en.wikipedia.org/wiki/Snake_charming
- https://www.juliannarae.com/blog/the-science-of-being-blue-the-rarest-of-natural-colors
- https://wagwalking.com/reptile/condition/abnormal-skin-shedding-in-snakes
- https://parcplace.org/wp-content/uploads/2017/08/cmflier.pdf
- https://a-z-animals.com/blog/what-does-a-copperhead-snake-look-like/
- http://www.wildlife-removal.com/snakecolorrhyme.html
- https://mathworld.wolfram.com/SnakeEyes.html
- https://a-z-animals.com/blog/how-to-identify-a-copperhead-the-x-step-guide-with-pictures/
- https://varmentguard.com/blog/keep-snakes-away-summer
- https://wingatepestandlawn.com/blog/2674752-tips-for-keeping-snakes-away/
- https://thepestrangers.com/how-to-get-rid-of-snakes-in-yard-house-9-tips/
- https://www.callnorthwest.com/2020/03/4-ways-to-keep-snakes-out-of-your-yard/
- https://www.nps.gov/blue/planyourvisit/poisonous-snakes.htm
- https://en.wikipedia.org/wiki/List_of_dangerous_snakes
- https://www.nhm.ac.uk/discover/news/2016/september/study-sheds-light-on-snake-vision.html
- https://reptilecraze.com/signs-that-your-snake-is-dying/
- https://www.thebiodude.com/blogs/helpful-husbandry-faqs/red-bulbs-and-reptiles-why-they-are-detrimental-and-can-harm-your-pets-photoperiod
- https://news.mongabay.com/2011/07/animal-picture-of-the-day-the-worlds-most-blue-lizard/
- https://a-z-animals.com/blog/when-do-snakes-come-out/
- https://herpsofnc.org/faq/
- https://www.nationalgeographic.com/animals/article/animal-blood-comes-in-a-rainbow-of-colors
- https://animals.mom.com/snakes-blue-eyes-8098.html
- https://www.biosphereonline.com/2016/09/06/snake-vision-what-do-snakes-see/
- https://reptifiles.com/ball-python-care-guide/ball-python-humidity-temperatures/
- https://www.pawtracks.com/other-animals/know-if-snake-sleeping/
- https://vetmed.tamu.edu/news/pet-talk/reptile-emotions/
- https://www.floridamuseum.ufl.edu/florida-snake-id/snake/eastern-copperhead/
- https://www.thehealthyjournal.com/faq/can-snakes-see-color
- https://www.medicalnewstoday.com/articles/eye-color-percentage
- https://www.livescience.com/44008-corn-snakes.html
- https://www.nationalgeographic.com/animals/article/150323-opossums-snakes-snakebites-venom-health-world-science
- https://a-z-animals.com/blog/how-often-do-snakes-shed/
- https://a-z-animals.com/blog/how-long-can-a-snake-go-without-eating/
- https://www.petsathome.com/pet-talk/pet-care-reptile-snakes-how-to-handle-snakes
- https://www.thehealthyjournal.com/faq/what-does-garlic-do-to-snakes
- https://coopervision.com/blog/7-bizarre-eye-conditions
- https://www.uptowneyecare.com/blog/rare-green-eyes/
- https://www.fandom.com/articles/snake-eyes-larry-hama-race
- https://sciencenordic.com/animals-biology-denmark/snakes-eyes-could-give-us-super-eyesight/1430322
- https://arew.org/what-colors-attract-snakes-the-most/
- https://blogs.biomedcentral.com/on-biology/2018/01/15/variability-of-eye-coloration-in-humans-and-animals/
- https://allanspetcenter.com/how-to-identify-a-venomous-snake/
- https://www.peta.org/living/animal-companions/snakes-never-pets/
- https://zoologicalwildlifefoundation.com/visit/animals/golden-tabby-tiger/
- https://a-z-animals.com/blog/these-2-snakes-have-absolutely-gorgeous-blue-eyes/
- https://australian.museum/learn/animals/reptiles/blind-snake/
- https://www.snakesforpets.com/how-to-tell-if-a-snake-is-comfortable-with-you/
- https://nationalzoo.si.edu/animals/news/do-snakes-have-ears-and-other-sensational-serpent-questions
- https://smithspestmanagement.com/blog/post/how-to-get-rid-of-snakes/
- https://www.newsweek.com/its-baby-copperhead-snake-season-heres-what-you-need-look-out-1527747
- http://www.riverlandingsanimalclinic.com/news/2019/7/8/stargazing-syndrome-in-snakes
- https://www.terrariumquest.com/ball-python/dying-signs/
- https://nature.discoveryplace.org/blog/ask-a-naturalist-how-do-i-know-if-a-snake-is-a-copperhead
- https://www.callnorthwest.com/2019/04/home-remedies-to-keep-snakes-away/
- https://www.thesprucepets.com/snake-lights-1239471
- https://pubmed.ncbi.nlm.nih.gov/19278018/
- https://www.thehealthyjournal.com/faq/are-rainbow-tiger-eyes-natural
- https://www.worldwildlife.org/stories/the-truth-about-white-tigers
- https://www.livescience.com/43641-copperhead-snake.html
- https://eyecareproject.com/myth/two-blue-eyed-parents-cant-produce-a-child-with-brown-eyes/
- https://similarbutdifferentanimals.com/2018/02/24/why-do-some-snakes-have-a-blue-spot-or-a-blue-eye/
- https://www.thesprucepets.com/how-to-tell-sex-of-snakes-1239488
- https://my.clevelandclinic.org/health/symptoms/22238-dilated-pupils
- https://www.rochester.edu/pr/releases/bcs/snake.htm
- https://slate.com/news-and-politics/2006/11/can-humans-mate-with-other-animals.html
- https://homework.study.com/explanation/do-wolves-have-blue-eyes.html
- https://vcahospitals.com/know-your-pet/do-dogs-see-color
- https://www.petcovergroup.com/au/shedding-in-snakes-dos-and-donts/
- https://atlanticeyeinstitute.com/does-eye-color-affect-vision/
- https://www.dnr.state.mn.us/reptiles_amphibians/smoothgreensnake.html
- https://www.nhm.ac.uk/discover/amazing-eyes-vision-champions.html
- https://www.arrowexterminators.com/learning-center/blog/5-harmless-snakes-commonly-mistaken-for-dangerous-ones
- https://a-z-animals.com/blog/venomous-vs-non-venomous-snake/
- https://homework.study.com/explanation/what-color-are-gorillas-eyes.html
- https://www.animalsaroundtheglobe.com/animals-with-the-worst-memory/
- https://www.facebook.com/MiamiDadeFireRescue/videos/how-to-identify-a-coral-snake/1772499976120547/
- https://www.science.org.au/curious/earth-environment/animals-can-live-forever
- https://a-z-animals.com/blog/can-snakes-hear-or-are-they-deaf-do-snakes-have-ears/
- https://www.thehealthyjournal.com/faq/can-snakes-have-feelings
- https://www.everythingreptiles.com/blue-eyed-leucistic-ball-python/
- https://www.mymove.com/pest-control/remove-snakes/
- https://wsed.org/the-last-word-on-the-rhyme/
- https://www.sciencefocus.com/nature/why-do-cats-and-snakes-have-slits-for-pupils/
- https://vcahospitals.com/know-your-pet/snakes-problems
- https://theconversation.com/curious-kids-when-a-snake-sheds-its-skin-why-isnt-it-colourful-160997
- https://wildtrails.in/wildlife-tiger-facts-look-into-the-eyes-of-the-tiger/
- https://www.reconnectwithnature.org/news-events/the-buzz/nature-curiosity-why-do-snakes-shed-their-skin/
- https://howitsee.com/what-colors-do-snakes-see/
- https://www.realonlinegambling.com/terms/snake-eyes/
- https://www.verywellhealth.com/what-is-the-rarest-eye-color-5087302
- https://www.terrariumquest.com/ball-python/shedding/
- https://wonderopolis.org/wonder/why-do-snakes-shed-their-skin
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3367750/
- https://myvision.org/education/blue-eyes/
- https://www.petmd.com/reptile/care/how-bathe-your-reptile
- https://www.crittercontrol.com/wildlife/snakes/snake-life-cycle
- https://wheremyscalesslither.weebly.com/stuck-shed.html
- https://www.worldanimalprotection.ca/news/5-fascinating-facts-about-snakes-you-didnt-know
- https://www.thehealthyjournal.com/faq/what-colors-do-snakes-see-best
- https://www.thesprucepets.com/are-snakes-bothered-by-loud-noises-1239469
- https://www.economist.com/science-and-technology/2018/04/05/three-eyed-lizards-are-not-uncommon-four-eyed-ones-are-a-novelty
- https://www.reptiledirect.com/blue-eyed-leucistic-ball-python/
- https://www.britannica.com/story/whats-the-difference-between-venomous-and-poisonous
- https://www.pawtracks.com/getting-started/blue-eyed-dogs/
- https://www.crittercontrol.com/wildlife/snakes/snake-feces
- https://www.mcgill.ca/oss/article/did-you-know-general-science/fake-snake-news-how-not-identify-poisonous-snake
- https://www.quora.com/Is-it-true-that-snakes-have-no-bond-with-their-owners-and-will-attack-them-when-they-feel-like-it
- https://www.4elephants.org/blog/article/6-facts-about-an-elephants-eye-vision
- https://www.thesprucepets.com/do-snakes-like-being-pet-5195042
- https://www.rd.com/article/rarest-eye-color/
- https://en.wikipedia.org/wiki/Eye_color
- https://www.pampers.com/en-us/baby/development/article/when-do-babies-eyes-change-color
- https://www.snakesforpets.com/shedding-process-of-ball-python/
- https://thorogoodusa.com/can-snakes-bite-through-rubber-boots/
- https://chisos.com/blogs/cowboy-boot-blog/will-cowboy-boots-protect-you-from-snakes
- https://animals.mom.com/can-snakes-tell-people-apart-11358.html
- https://www.cascadekennels.com/reptile-shedding-2/
- https://www.nbcnews.com/sciencemain/snakes-have-poor-eyesight-can-boost-their-vision-if-threatened-2d11577701
- https://www.thebiodude.com/blogs/helpful-husbandry-faqs/reptile-vision-what-you-need-to-know-and-how-it-pertains-to-your-husbandry
- https://havesnakeswilltravel.com/handling-dead-snakes/betty/
- https://nationalzoo.si.edu/animals/grand-cayman-blue-iguana
- https://familydoctor.org/avoiding-snakebites/
- https://www.petmd.com/dog/general-health/what-colors-do-dogs-see
- https://www.virginiaherpetologicalsociety.com/venomous-look-a-likes/copperhead-look-a-likes/copperhead.html
- https://www.ndtv.com/offbeat/viral-video-this-blue-snake-is-as-dangerous-as-it-is-beautiful-2297417
- https://vestapropertyservices.com/how-to-tell-if-a-snake-is-poisonous/
- https://reptile.guide/reptile-eyes/
- https://www.facebook.com/ncwhm/photos/did-you-know-that-cowboys-were-notoriously-superstitious-one-cowboy-superstition/10157881087833950/
- https://www.learnaboutcritters.org/rules/
- https://animals.mom.com/eye-color-change-ball-pythons-2722.html
- https://mightygadget.co.uk/what-happens-when-you-roll-snake-eyes-in-craps/
- https://villains.fandom.com/wiki/Storm_Shadow_(G.I._Joe)
- https://animals.mom.com/tell-snakes-start-shed-6412.html
- https://www.aucklandeye.co.nz/about/blog/7-interesting-facts-about-blue-eyes/
- https://reptilesmagazine.com/what-is-the-rarest-color-in-reptiles/
- https://biobeat.nigms.nih.gov/2019/02/roses-are-red-and-so-is-blood/
- https://www.thesprucepets.com/snake-sheds-its-skin-1239489
- https://a-z-animals.com/blog/do-snakes-have-green-eyes/
- https://www.vetwest.com.au/pet-library/can-animals-see-colour
- https://www.peta.org/features/list-will-change-feel-snakes/
- https://www.lenstore.co.uk/eyecare/what-are-the-most-attractive-eye-colours
- https://www.nature.com/articles/news.2010.122
- https://en.wikipedia.org/wiki/Snake_Eyes_(G.I._Joe)
- https://www.aphis.usda.gov/wildlife_damage/nwrc/publications/Tech_Notes/TN_SnakeRepellents.pdf
- https://collegeofphysicians.org/programs/education-blog/behind-blue-eyes-look-genetic-and-cultural-components-propelled-spread-blue-eyed-humans/
- https://www.facebook.com/harveycountyparks/posts/eye-shine-how-many-of-you-have-been-startled-at-night-by-a-set-of-eyes-gleaming-/985602994822231/
- https://medlineplus.gov/ency/presentations/100138_3.htm
- https://www.visioncenter.org/conditions/grey-eyes/
- https://www.terminix.com/blog/education/how-to-tell-if-a-snake-is-poisonous/
- https://set.adelaide.edu.au/news/list/2019/08/20/why-is-the-colour-blue-so-rare-in-nature
- https://vision-boutique.com/is-there-such-thing-as-purple-eyes/
- https://www.livescience.com/32114-can-snakes-see-well.html
- http://aeacarizona.com/Skin_Shedding_in_Snakes_AEAC.pdf
- https://www.snakesforpets.com/snakes-with-blue-eyes/
- https://fishbio.com/blue-caboose/
- https://www.cajunencounters.com/blog/venomous-versus-non-venomous-snakes/
- https://www.allaboutvision.com/eye-care/eye-anatomy/gray-eyes/