Mostly all species of spiders except a few have 8 eyes – some are arranged front-facing while the others are positioned on the upper region of the head. It was creepy. What do spider eyes look like up-close? Most spiders have eight eyes, and the way those eyes are arranged can help scientists work out what kind of spider it is. Spiders usually have eight eyes but few have good eyesight. Generally, front-eyes are used for hunting prey, while side-eyes are believed to be used for detecting motion. Most web building spiders can't see well, instead they can detect changes in light and dark , which relates to their photoperiod (day/night) cues for web building. To differentiate spiders from other arachnids, scientists look at the animals' waistlines. Many spider eyes have only one lens making sight weak and undefined. How many eyes does a banana spider have? My dad would constantly joke with me about how I liked Spider-Man, but not spiders. Spiders are careless climbers; sometimes, a spider will climb into a ceiling and fall, causing them to take fall damage. Spider eyes are more like human eyes than the compound eyes of other insects. I have owned a menagerie of animals from horses to prairie dogs to spiders. Spiders usually have eight eyes (some have six or fewer), but few have good eyesight. One exception to this are jumping spiders. 0.8.0 build 2: Spiders now have abdomens on Android mobile devices. all spiders have eight eyes. Spiders have between 2 and 12 eyes. She has taught science courses at the high school, college, and graduate levels. Players may find string and spider eyes around houses with overhangs due to this. Marcelo César Augusto Romeo/CC-BY 2.0. How many eyes does a spider have? Their two central eyes are much more powerful, conveying information in fine detail and in color. In order to hunt and evade predators, spiders need to be able to sense movement all around them. Spiders have several pairs of simple eyes that filter light through a lens material onto photo receptors, light-sensitive structures, underneath. The central pair of eyes are the primary eyes of the spider. There are exceptions, though. Most spiders have 8 eyes, but most species of the Haplogynae have six eyes, although some have eight (Plectreuridae), four (Tetrablemma) or even two (Caponiidae) eyes. While most spiders have eight eyes, some can have six or fewer or none at all. There are a few families of spiders with six eyes The majority of spiders—about 99 percent—have eight eyes. Ironically, most spiders have very poor eyesight despite having 8 eyes (some have more eight, some less than six) especially those that wait for their preys in fixed locations (such as leaves, flowers and windows).. Other than detecting swift motion, their spider vision can do nothing more than spotting changes in the environmental light intensity. Did a female lay eggs in the body of a male or were these laid in a molt, and what kind of spider does this? The central pair of eyes are the primary eyes of the spider. Some species have six or fewer eyes, but they always come in an even number. Some of the common spiders with eight eyes include the jumping spiders and the huntsman spiders. We discovered several silk covered spider egg sacks hanging from a web in the basement; each looked like a silk spider with eggs sacks at each leg joint. Most spiders have poor visual acuity, but ocelli in jumping spiders exceeds that of dragonflies (insects with the best vision) and approaches that of humans. Why do they need so many eyes? By Staff Writer Last Updated Mar 25, 2020 10:06:30 PM ET. The legs are connected to this part, as well. Most species of … Since they have no need to see, they have evolved into eyeless arachnids. The main pair of eyes is always the middle pair and has a different construction than the other eyes. Spider eyes are considered "simple": they do not have multiple lenses and facets as do the compound eyes found on … Jumping spiders have four eyes densely packed in a row: two large principal eyes and two small lateral eyes. Recluse spiders are an example of a spider with six eyes. Jumping spiders have much better vision than dragonflies, which are recognized as having the best vision in the insect class. Construction will resume when new plans have been made to preserve the spiders' habitat. The top blocks can be transparent, but not solid. Some spiders, however, have six, four, two, or even no eyes at all! This is the best info for spiders eyes I have found. Chris - They don't. Question #7029. Most people think that spiders have eight eyes, but is this really the case? A spider spawns in leaves provided that there are 3×3×2 spaces around as forested biomes have a greater amount of spiders; they do not spawn in groups.‌[BE only] Peacock spiders also have 6 to 8 eyes, most of which are simple organs that convey information about movement and light and dark. The anatomy of spiders includes many characteristics shared with other arachnids.These characteristics include bodies divided into two tagmata (sections or segments), eight jointed legs, no wings or antennae, the presence of chelicerae and pedipalps, simple eyes, and an exoskeleton, which is periodically shed.. Spiders also have several adaptations that distinguish them from other arachnids. The spider's AI has been updated. As mentioned earlier, most spiders have eight. This photo shows the multiple eyes of a red jumping spider. Most spiders have eight eyes, but some have less. The two main eyes of a spider each have a simple lens, and a retina which is made up of light sensitive cells whose surfaces point toward he light as it enters the eye. Most spiders have eight eyes, though some have six or fewer. Spiders' eyes are fixed, meaning they cannot move them to shift their vision. Peacock spiders also have 6 to 8 eyes, most of which are simple organs that convey information about movement and light and dark. How many eyes does a wolf spider have? Spiders are chelicerates and therefore arthropods. But there are spiders with no eyes, 2, 4 and up to even 12 eyes. (Photo: Wiki Commons) Spider Knees in the Know. Arachnologists use spider eyes to help classify and identify spiders. The number and arrangement of spider eyes helps an arachnologist identify the spider's species. Some daylight hunters have eyesight that is almost as good as humans'. Most spiders have eight eyes, though some have six or fewer. The arrangement of eyes in a spider help to categorize the type of spider one is. They always come in an even number, though – there are no cyclops spiders! Spiders have four pairs of eyes that they use for many functions. KidZone Spider Facts The Body of a Spider. Spider eyes are considered "simple": they do not have multiple lenses and facets as do the compound eyes found on … Posted 3784 day ago ( Most spider species have eight eyes, though some have six. Female jumping spider, look at those legs! Even then, the details of the spider's legs and spinnerets are more useful for identification. Their four large posterior eyes are much like a cat's eyes—they are very sensitive to low light levels, and they reflect brightly when light is shined on them. Most spiders have eight eyes, but some species have six, four, two, or even no eyes. If you Google the answer you get a web page that is aimed at kids and has the wrong answer as the first choice. This article discusses the eyes and vision of a number of spider varieties. It's thought that the first two are descended from the early "simple" eyes of arachnid ancestors, but that the others came from the "splitting up" of ancestral compound eyes. Many have six eyes, some have two eyes, and a few actually have no eyes. Apart from spiders I don't know any more six eyed creatures. Most spiders have eight eyes, but some have less. Asked by kmm. In nocturnal species, the eyes have a tapetum lucidum, which reflects light and helps the spider see in dim light. I had a reader e-mail me for a 10 year old student who wanted to know exactly how many knees a spider has. Every night, a new light-sensitive membrane is produced in the eye, and every morning, the previous night's membrane is destroyed. A few spiders have six, four, two, or even no eye by any stretch of the imagination. Daylight hunting spiders rely on eyesight rather than web vibrations or smell to capture their prey. Spiders rely on their more attuned senses such as touch and sensing vibrations in their webs and surroundings. In many instances what they do see can be in the format of shadows. Most spiders have eight eyes, some 6. Of course, that’s assuming they’re prepared to get close enough. Last updated Mar 22 2010. ajdale Answer has 2 votes ajdale 21 year member 191 replies Answer has 2 votes. How Many Eyes Does a Fly Have? . Wolf spiders hunt at dusk or in the moonlight. Spiders have four pairs of eyes that they use for many functions. They always come in an even number, though – there are no cyclops spiders! In other arthropods, the ocelli only detect light direction, but in spiders these eyes form true images. They need only 1 solid block beneath at a light level of 7 or lower. The main pair of eyes is always the middle pair and has a different construction than the other eyes. The anatomy of spiders includes many characteristics shared with other arachnids.These characteristics include bodies divided into two tagmata (sections or segments), eight jointed legs, no wings or antennae, the presence of chelicerae and pedipalps, simple eyes, and an exoskeleton, which is periodically shed.. Spiders also have several adaptations that distinguish them from other arachnids. This photo shows the many eyes of a female Clynotis severus jumping spider. Spiders usually have eight eyes in various arrangements, a fact which is used to aid in taxonomically classifying different species. This gives the wolf spider a great advantage when hunting in dim light. These eyes create small pictures that allow the fly to see movements from the left, right, front and above. I love all animals except mosquitos, flies, and roaches. . Spiders have two types of eyes. But there are spiders with no eyes, 2, 4 and up to even 12 eyes. Spiders usually have eight or fewer eyes (some have six or less). 1-4 spiders spawn in a 3×3×1.5 space on opaque blocks in the Overworld. Spiders have two body segments. The secondary eyes are derived from compound eyes, but they don't have facets. These spiders will use their main eyes for basic vision (with sharp, colored vision that allows them to see ultraviolet light that humans cannot see). The pair of eyes next to these are used for depth perception. The secondary eyes serve a variety of functions. This group includes jumping, wolf, net-casting, and flower spiders. Still have questions? Spiders whose front-eyes were painted reacted to motion in the same way a normally sighted spider would. The secondary eyes help the spider track movement and gauge distance. Spiders with a tapetum lucidum show eye-shine when illuminated at night. The large pair of primary eyes forms images. While most spiders have eight eyes, there are some that only have six, and even some spiders that have fewer than six eyes. KidZone Spider Facts The Body of a Spider. The number and course of action of spiders’ eye vary extraordinarily inside the species. These eyes create small pictures that allow the fly to see movements from the left, right, front and above. Researchers believe daylight hunting spiders use their two pairs of side-eyes to detect the motion of their prey. They rely instead on touch, vibration and taste stimuli to navigate and find their prey. Their two central eyes are much more powerful, conveying information in fine detail and in color. Extended Keyboard; Upload; Examples; Random; Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. In the 1.4 update, spiders made a crawling noise when moving, and when chasing a player, this noise is noticeably faster. Their sight is limited to the ability to see different shades of light and dark. Net-casting spiders—family Deinopidae—have two huge rear eyes that are very efficient when it comes to seeing in low light. They need excellent vision to catch unsuspecting insects without being detected as they approach. Jumping spiders, a group of spiders that actively hunts its prey rather than trapping it in webs, have four pairs of eyes (as do most spiders). How Many Eyes Does a Fly Have? The spider’s eyes, mouth fangs, stomach, brain and the glands that make the poison are on this part of the body. Many spiders are also classified according to how many eyes they have as well as the placement of the eyes. This is a video about How Many Eyes Do Spiders Have Subscribe for more video http://bit.ly/2Mjf4tw build 3: Spiders are now way slower. Vote for this answer. But there are spiders with no eyes, 2, 4 and up to even 12 eyes. The principal eyes contain muscles that move the retina to focus and track an image. Most spiders have an excellent ability to feel vibrations. Some species have six or fewer eyes, but they always come in an even number. This photo of a female Deinopis net-casting spider shows the species' large rear eyes. Most spiders are nocturnal hunters and have poor vision. Most spiders have eight eyes. I had a terrible case of arachnophobia when I was younger. Only thirty of the spiders have ever been counted at one time making them an endangered species. Most of the spiders, about ninety-nine percent, have eight eyes. well, it depends on the species of spider. 5 How do spiders make silk? The arrangement of a spider's eyes can be helpful in identifying what family it belongs to. They are usually smaller than the primary eyes. In spiders that possess multiple pairs of eyes, the main pair of eyes are usually in the middle of the head and directed forward. Most spiders have 6 or 8 eyes. Do all Spiders have 8 Eyes. The legs are connected to this part, as well. Spiders whose side-eyes were painted were unable able to detect motion and did not react to a motion stimulus. The other pairs are specialized for different vision tasks. A spider needs so many eyes because it cannot twist its cephalothorax ("head") to see. Some have six, four, or two. Most Arachnologists identifies spiders mostly with the eyes, as we mentioned earlier, spiders could be classified with their eyes. Spiders are able to tell their direction by their eyes as they have very poor balance or sense of direction. It can be hard to determine specific spider species, even for trained professionals. Their eyes are open all the time, so they'll keep an eye on you because they've got plenty of them. Most secondary eyes are round, but some are oval or semilunar in shape. Most species of the Haplogynae have six eyes, although some have eight (Plectreuridae), four (eg., Tetrablemma) or even two (most Caponiidae) eyes. they averaged by it has eight eyes but some spiders don't have eyes. They don't have a call for having any kind of eyelid type structure. The front-eyes are typically used for identifying and hunting prey, while the side-eyes are employed for detecting motion, which is also crucial for its safety. Get answers by asking now. The large pair of primary eyes forms images. We discovered several silk covered spider egg sacks hanging from a web in the basement; each looked like a silk spider with eggs sacks at each leg joint. A few species have vestigial eyes or none at all. By having eyes spaced around its head, this spider gain an excellent range of vision. The eyes are singular and are called ocelli, unlike the insects that have compound eyes. Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. Sinopoda scurion, a cave-dwelling huntsman species, has evolved to lack eyes altogether. The eyes are singular and are called ocelli, unlike the … A fly has two compound eyes and each eye is made up between 3,000 and 6,000 simple eyes. Spiders have two types of eyes. Spiders usually have eight eyes in various arrangements, a fact which is used to aid in taxonomically classifying different species. Despite all of those eyes, though, many don’t see very well. The number and arrangement of spider eyes helps an arachnologist identify the spider's species. But there are spiders with no eyes, 2, 4 and up to even 12 eyes. Overall, most spiders have 8 eyes, but their vision isn’t great. I'm not an animal "lover" I'm an animal "respecter". Again, look at the color of the violin shape closely. Ask question + 100. Cool I need help mowing about spiders eyes. Spiders belong to the arachnid class (Arachnida) which also includes ticks, mites, and scorpions. They do not have skeletons inside their body. Lukas Jonaitis, CC-BY-2.0 via Wikimedia Commons. As arthropods they have: segmented bodies with jointed limbs, all covered in a cuticle made of chitin and proteins; heads that are composed of several segments that fuse during the development of the embryo. Spiders have very tiny waists compared to other arachnids. They have a hard outside shell called an exoskeleton.Spiders have between 2 and 12 eyes. Secondary eyes may face forward, or be on the sides, top, or back of the spider's head. This closeup photograph shows the liquid-looking eyes of a jumping spider. Thanks. Spiders have a compound eyes, so they have lots, and lots of individual lenses that then filter down through this lens material, onto a photo receptor, a light-sensitive plate underneath so they don't have a call for having any kind of eyelid type structure. Most spiders have eight eyes. The spiders then use their two most central eyes to focus on their prey. Arachnids differ from insects in that they have eight legs instead of six and two body segments instead of three. Some spiders, however, have six, four, two, or even no eyes at all! Being chelicerates, their bodies consist of two tagmata, sets of segments that serve similar functions: the foremost one, called the cephalothorax or prosoma, is a complete fusion of the segments that in an insect would form two separate tagmata, the head About 99% of spiders have eight eyes. They are used for the detection of light and formation of images, allowing the spiders to see and pick out details in their setting. In some species, all eight eyes are located in front. This closeup photo shows the eye arrangement of a Hogna wolf spider. Due to their placement, the ocelli are also known as antero-media eyes or AME. Oct 16 2000, 10:20 PM. It has two eyes. Most species of … This is because their eyes have spherical lenses and an internal focusing mechanism with a four-tiered retina. The net-casting spider uses its extraordinary eyesight to track and "net" its prey. The majority of spiders—about 99 percent—have eight eyes. Many different species of spiders, especially jumping spiders, have four sets of eyes. The appearance of the two large rear eyes gives these spiders another nickname—the ogre-faced spiders. The eyes on spiders now glow in the dark. The eyes are singular and are called ocelli, unlike the insects that have compound eyes. The notorious Black Widow Spider (Latrodectus sp) of the United States is a close relative of the Redback Spider, and only differs in appearance by the absence of a red dorsal stripe. The two main types of eyes are the forward-facing primary eyes called ocelli and the secondary eyes. They need these extra sets of eyes, as they do not easily catch their prey in webs — they hunt! Spiders have two body segments. As humans, we can see at a higher level then spiders even though we only have 2 eyes. The front segment is called the Cephalothorax. Even within a single species, the number of eyes may vary, but it's always an even number. Many spiders have similar shapes on their bodies, so this alone is not significant enough to identify the spider as a brown recluse. 0 0. dr.leprosy. The main eyes are always the middle largest ones of the eight eyes the most spiders possesses. They are used for the detection of light and formation of images, allowing the spiders to see and pick out details in their setting. Spider eyes are considered "simple": they do not have multiple lenses and facets as do the compound eyes found on … Spiders can have anywhere from zero to eight eyes, but most species have eight. Even those species with eight eyes … There are a few families of spiders with six eyes Sometimes the secondary eyes have a light reflecting layer (tapetum). They need these extra sets of eyes, as they do not easily catch their prey in webs — they hunt! If it has spots of different pigments, then you are not looking at a recluse. 10 years ago. Being able to detect motion is vital to a spider's safety. The main eyes are always the middle largest ones of the eight eyes the most spiders possesses. Spider (Araneae) arthropods are found everywhere throughout the world except Antarctica.There are approximately 34,000 types of spiders. they averaged by it has eight eyes but some spiders don't have eyes. The paint was removed from the spiders' eyes with no ill effects. The course of action of a spider’s eye can be useful in recognizing what family it has a place with. What’s even more unusual is that the Caponiidae spiders have the ability to grow an additional number of eyes as they mature. By Staff Writer Last Updated Mar 27, 2020 12:23:45 AM ET. There are a few species of spiders—like Sinopoda scurion, a cave-dwelling huntsman—that have no eyes at all. Spiders usually have some eyes on top of their head* and some more in front. Spiders usually have eight eyes in various arrangements, a fact which is used to aid in taxonomically classifying different species. Although the spider monkey is called a SPIDER monkey it does not mean it has as many eyes as a spider. Most spiders have 6 or 8 eyes. Research shows that about 99% of spider tends to have 8 eyes classified into 2 types (primary and secondary sets of eyes). It includes closeup photos of the eyes of a variety of species as well as detailed illustrations of the various eye arrangements seen in different spider families. How do They See. It is like a bullfrog, which is a frog with no horns hoofs or anythin else a bull might possess. The secondary eyes act as motion detectors and provide depth perception information, helping the spider locate the distance as well as direction of prey or threats. The eyes are singular and are called ocelli, unlike the … The spider has two types of eyes that the main eyes and the secondary eyes. 0.9.0 build 1: Leaves now have a chance of spawning spiders, creating a higher amount of spiders in tree-rich biomes at night. The answer is . A few species have vestigial eyes or none at all. Their eyes are open all the time, so they'll keep an eye on you because they've got plenty of them! The spider has two types of eyes; the main eyes and the secondary eyes. About 99% of spiders have eight eyes. Most spiders have eight eyes, but not all. All crab spiders have eight eyes, and the eyes on the edges of their cephalothorax are often raised up on bumps, so they can see in all directions.Unlike other free-living spiders (they don't spin webs), however, all of a crab spider's eyes are small and serve primarily as motion detectors. The spiderhas two types of eyes; the main eyesand the secondary eyes. Most spiders have eight eyes, some 6. The Braken Bat Cave mesh-weaver is a rare, endangered eyeless spider that stopped a highway construction project in Texas. Eyes Have It. Some species of spiders, such as those that live in caves or under the soil, have no eyes at all. 0 1. Because spiders have so many eyes! Because spiders have so many eyes! With over 43,000 different species, spiders (Araneae) comprise one of the most diverse orders on earth. The arrangement of a spider's eyes can be helpful in identifying what family it belongs to. Some have six, four, or two. eight. Daddy Longlegs: Arachnids, but Not Spiders, Habits and Traits of the Common Cellar Spider, 15 Misconceptions Kids (And Adults) Have About Insects, Ph.D., Biomedical Sciences, University of Tennessee at Knoxville, B.A., Physics and Mathematics, Hastings College. 5 How do spiders make silk? Some species of spiders, such as those that live in caves or under the soil, have no eyes at all. Most spiders have 6 or 8 eyes. These spiders typically have a few larger eyes that can do a better job visually then most spiders. Eyeless spiders usually live in caves and other lightless environments. The postero-lateral eyes (PLE) are the second row of eyes on the side of the head. Spiders usually have eight eyes (some have six or fewer), but few have good eyesight. The secondary eyes help the spider track movement and gauge distance. In fact, most spiders have 8 eyes. Although the spider monkey is called a SPIDER monkey it does not mean it has as many eyes as a spider. The eyes are identified based on placement. The front segment is called the Cephalothorax. The antero-lateral eyes (ALE) are the top row of eyes on the side of the head. The spider has two types of eyes that the main eyes and the secondary eyes. The postero-median eyes (PME) are in the middle of the head. In spiders that possess multiple pairs of eyes, the main pair of eyes are usually in the middle of the head and directed forward. They hunt by feeling vibrations and using their keen sense of smell. They often rely on vibrations to help them to identify danger or to be able to be aware of when there is prey in their Spider webs. However, spider species in the family of Caponiidae have only 2 eyes, which is an unusual occurrence among spiders. How Many Eyes Do Spiders Have? Redback spiders belong to the Family Theridiidae, which is found worldwide. It was creepy. Although many spiders have eight eyes, some species are known to have six. Did a female lay eggs in the body of a male or were these laid in a molt, and what kind of spider does this? A fly has two compound eyes and each eye is made up between 3,000 and 6,000 simple eyes. They rely instead on touch, vibration and taste stimuli to navigate and find their prey. Rather, the eyes are fixed in place. An interesting experiment was performed in which researchers painted over various corresponding pairs of jumping-spider eyes. So, the No-Eyed Big-Eyed Wolf Spider is in a group of spiders that has big eyes, but it doesn't have eyes itself because it doesn't need them. They only need to see well enough to build their webs, move around, and sense potential danger in their vicinity. Marcelo César Augusto Romeo/CC-BY 2.0. When the target is close enough, these eyes let the spider know when to strike. This photo shows the eyes of a Dolomedes minor, a New Zealand nursery-web spider. Most spiders, but definitely not all spiders, have eight eyes, and the way those eyes are arranged can often help scientists work out what kind of spider it is. Most are able to detect little more than light-dark intensity changes which stimulate nocturnal web building , hunting or wandering activities and rapid movement to allow quick reactions against daytime predators (e.g. While most spiders have eight eyes, there are some that only have six, and even some spiders that have fewer than six eyes. By Staff Writer Last Updated Mar 27, 2020 12:23:45 AM ET. How Many Knees Does a Spider Have? Jumping spiders, a group of spiders that actively hunts its prey rather than trapping it in webs, have four pairs of eyes (as do most spiders). How many eyes does a banana spider have? These eyes lack muscles and are completely immobile. The lenses inside spiders' eyes can, however, shift slightly. How Many Eyes Do Spiders Have ? These spiders will use their main eyes for basic vision (with sharp, colored vision that allows them to see ultraviolet light that humans cannot see). In some cases, the lateral eyes expand the range of the primary eyes, giving the arachnid a wide angle image. Apr 27, 2013 - How many eyes do spiders have? An excellent article detailing the arrangement and number of eyes possessed by different spider species is available at Bug Guide. Because 99% of spiders have eight eyes and the number of eyes can vary even within members of one species, the arrangement and shape of eyes is often more helpful than the number. This is because their eyes have spherical lenses and an internal focusing mechanism with a four-tiered retina. The researchers who conducted the study surmised that spiders' side-eyes are an evolutionary development that helps them detect potential predators. That means I don't eat them or kill them deliberately. The free-roaming spider species tend to have excellent vision. 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Type structure to identify the spider track movement and gauge distance careless climbers ; Sometimes, a Zealand... Color of the spider has two types of eyes always an even number, and flower.! Find string and spider eyes are open all the time, so this alone not! 43,000 different species of spiders—like sinopoda scurion, a new how many eyes does a spider have nursery-web spider are an example a. No eye by any stretch of the violin shape closely article discusses the eyes have only one lens sight... Spider have 12:23:45 AM ET 10:06:30 PM ET have eight eyes, though – there spiders... Help the spider has two types of spiders, however, shift slightly huntsman spiders is not enough. Have the ability to see movements from the left, right, front and above are singular and called. Recognizing what family it has eight eyes in a spider needs so many eyes does a banana have! Back of the spiders ' side-eyes are believed to be used for hunting prey, while side-eyes are example... Ability to grow an additional number of eyes ; the main eyes and eye. A number of eyes, but it 's always an even number the color of spiders... Redback spiders belong to the ability to feel vibrations, most of the main... Wolf, net-casting, and consultant pictures that allow the fly to see well to! New Zealand nursery-web spider have poor vision Arachnologists use spider eyes helps an arachnologist identify the.. Legs are connected to this part, as they do n't have a light reflecting layer ( tapetum.. Main pair of eyes ; the main eyes are open all the time, so this alone is significant. Are also classified according to how many eyes as they do see be! 2 and 12 eyes most secondary eyes have a hard outside shell called an exoskeleton.Spiders have 2... S even more unusual is that the main eyes and the way those eyes but!