Spider web

Spiders make webs to catch food. They make silk from their bodies. This silk is very strong.

Some spiders eat their own webs. This helps them get energy back.

Spiders use silk in many ways. They use it to protect eggs. They also use it to stay safe.

Some webs are sticky. This helps trap bugs. Other webs are not sticky. This helps the spider move.

Spiders have tiny hairs on their legs. These hairs help them walk. They do not get stuck.

Webs have been around a long time. They are amazing tools for spiders.

Spiders use silk to make many things. Most spiders build webs to catch food. They make silk in parts called spinnerets. These parts are at the tip of their abdomen.

Spiders can make many types of silk. Some silk is sticky to trap prey. Other silk is not sticky. This helps the spider move around.

One common web is the orb web. It looks like a circle. The spider makes a strong line across a gap first. Then it adds lines that look like a wheel. It uses its own body to measure the spaces. Building a web takes a lot of power. The spider uses protein to make the silk. To save power, many spiders eat their own webs. This lets them recycle the silk. Webs have been around for 100 million years. Scientists study silk because it is very strong. They hope to make tough new materials from it.

A spider web is a clever structure made of protein silk. Spiders pull this silk from organs called spinnerets. Most spiders use these webs to catch insects for food. A clean web is often called a spider web. A dusty, abandoned web is called a cobweb. Some spiders, like the cobweb spiders, build tangled, three-dimensional webs. These webs help the spider catch prey without running after it. This is a very efficient way to find food.

Building an orb web happens in many careful steps. First, the spider makes a fine thread to drift on the breeze. When it hits a surface, the spider reels it in. It then walks along this line to make it stronger.

Next, the spider builds a Y-shaped frame with radial lines. It adds more lines until the web is complete. The spider uses its own body to measure the spacing. It often makes a web 20 times its own size.

Spiders have used silk for a very long time. They started making silk to protect eggs when they moved to land. These ancient spiders lived during the Early Devonian period.

We know webs are very old from fossils. A rare piece of amber from Sussex, England, shows webs from 100 million years ago. This was during the Early Cretaceous period. Spiders have been masters of silk for millions of years.

There are many different kinds of webs in nature. Orb weavers make circular webs in a vertical plane.

Some spiders make sheet webs that lie flat. Others make funnel webs or tubular webs that run along trees. Spiders use different types of silk for different jobs. They might use sticky silk to trap prey or fine silk to wrap it. Some spiders can even make eight different types of silk.

Humans have found many ways to use spider silk. In ancient Greece and Rome, people put cobwebs on wounds. The silk has vitamin K, which helps blood clot.

In the 16th century, artists made paintings using cobwebs. Some people even use webs in musical instruments to make a buzzing sound. Today, scientists study silk because it is incredibly strong. They hope to use its properties to create new, super-tough materials.

A spider web is a complex structure made of proteinaceous silk. Spiders extrude this silk from specialized organs called spinnerets. Most spiders build these structures to capture prey, such as insects, for food. While many people use the term "spider web" for a clean, active structure, the term "cobweb" often refers to an abandoned, dusty web. Biologists also use "cobweb" to describe the tangled, three-dimensional webs of the family Theridiidae. These spiders are also known as tangle-web or comb-footed spiders.

Spider silk production began when archaic spiders moved from water to land during the Early Devonian period. Initially, they used silk to protect their bodies and eggs. Over time, spiders evolved to use silk for hunting. This transition involved using silk for guide lines, then ground webs, and finally the aerial webs we see today. Silk is produced in glands located at the tip of the spider's abdomen. Each gland produces a specific type of thread for a specific task. Some spiders can produce up to eight different types of silk. These include sticky silk for trapping prey and fine silk for wrapping it.

Constructing a web is an energetically expensive process because silk requires large amounts of protein. To offset this cost, many spiders eat their own webs daily. This allows them to recycle the silk proteins through ingestion and digestion. Once a web is built, it becomes an efficient tool for gathering food. It allows the spider to catch prey without the energy spent running it down. Spiders can navigate their own webs using dense hairs and nonstick coatings on their feet. They also use specific non-sticky silk strands to move safely across the structure.

The construction of a classic orb web follows a very precise sequence. First, the spider releases a fine adhesive thread to drift on a breeze across a gap. When the thread sticks to a surface, the spider feels the vibration and reels it in. The spider then walks along this line to strengthen it with a second thread. After this, it builds a Y-shaped netting using radial lines. The spider continues adding radials until the web is complete. The number of radials depends on the size of the spider and the web. Often, a web is about 20 times the size of the spider.

The spider uses its own body as a measuring tool during construction. It creates a spiral of non-sticky, widely spaced threads to move around easily. The distance between these initial spirals is proportional to the distance from the spider's back legs to its spinnerets. Once the frame is set, the spider replaces the non-sticky spiral with a closely spaced, adhesive spiral. It works from the outside of the web toward the center. After finishing, the spider often sits near the hub, sometimes facing downwards, to wait for vibrations.

There are many distinct types of webs found in nature. Orb webs are usually built in a vertical plane by families like Araneidae. Sheet webs are built in a horizontal plane. Other variations include funnel webs, tubular webs that run along trees, and tangle webs. Some spiders, like the net-casting spider, use a small net attached to their front legs to lunge at prey. This method saves energy compared to active hunting. Other spiders use silk to catch the wind and sail to new locations. Even water-dwelling spiders use silk, such as the diving bell spider, which uses a web to trap air underwater.

Humans have interacted with spider webs for centuries in surprising ways. In ancient Greece and Rome, cobwebs were used as medical dressings for wounds. This worked because silk is rich in vitamin K, which is essential for blood clotting. In the 16th century, artists in the Austrian Tyrolean Alps created "cobweb paintings" by applying watercolor to layered webs. In Nigeria, spider webs are used in traditional xylophones to create a buzzing sound. Today, scientists study the incredible strength of spider silk. They hope to develop new, super-tough materials based on these biological properties.