Necrobotics: Turning Dead Spiders Into Robots (Yes, Really)

Picture this: You're working in a robotics lab, trying to design the perfect mechanical gripper. It needs to be small, delicate enough to handle fragile objects, strong enough to lift things heavier than itself, and ideally biodegradable so it doesn't create electronic waste.

You spend months designing, prototyping, testing. Nothing works quite right. Traditional grippers have too many moving parts. They break easily. They're expensive to manufacture. They're not precise enough for delicate work. Then one day, you spot a dead spider curled up in the corner of your lab. And you have a thought that sounds absolutely crazy: What if the spider itself IS the gripper?

Welcome to necrobotics, a brand-new field of robotics where scientists use dead organisms (particularly spiders) as ready-made robotic components. It sounds like something from a horror movie, but it's real science happening right now at Rice University in Houston, Texas. And it's actually brilliant.

The Discovery That Started It All

In 2019, Dr. Daniel Preston had just established his mechanical engineering lab at Rice University. His graduate student, Faye Yap, was moving equipment around when she noticed something: a dead spider curled up at the edge of the hallway. Most people would have swept it away without a second thought. But Yap was curious. "We were really curious as to why spiders curl up after they die," she said.

A quick Google search revealed something fascinating about spider anatomy. Unlike humans, who have opposing muscle pairs (like biceps and triceps that work against each other), spiders only have flexor muscles that pull their legs inward. They don't have muscles to extend their legs back out.

So how do spiders move? Through hydraulic pressure. Their bodies work like tiny hydraulic systems, similar to the machinery that operates car brakes or construction equipment. Spiders pump hemolymph (their version of blood) into their legs to extend them. When they stop pumping, the flexor muscles naturally curl the legs back in.

When a spider dies, it loses the ability to pump hemolymph. The flexor muscles take over, and the legs curl inward. That's why all dead spiders end up in that characteristic curled position. Yap and Preston looked at each other and had the same thought: "What if we could pump something else into a dead spider to make the legs extend again?"

The Experiment: Creating the World's First Necrobotic Gripper

The setup was surprisingly simple. Yap took a deceased wolf spider, inserted a needle into its prosoma (the main body chamber where the hydraulic system is located), sealed it with a dab of superglue, and attached the other end of the needle to a syringe.

Then she gave the syringe a small puff of air. The spider's legs instantly extended outward. "When we did it, it worked, the first time, right off the bat actually," Yap said in a video demonstration. "I don't even know how to describe it, that moment when you see it move." Release the air, and the legs curled back in. Another puff, and they extended again. The dead spider had become a gripper, opening and closing like a tiny mechanical claw.

And it worked incredibly well. The necrobotic spiders could:

• Pick up objects more than 130% of their own body weight

• Handle delicate items without damaging them

• Last through at least 1,000 open-close cycles before showing wear

• Grip with a force of 0.35 millinewtons (perfect for tiny, fragile objects)

How It Actually Works

Understanding why this works requires understanding spider hydraulics.

Living spiders have an internal chamber called the prosoma filled with hemolymph. Inside this chamber are valves that control flow to each leg individually. When a spider wants to extend a specific leg, it opens that leg's valve and increases pressure in the prosoma, forcing hemolymph into that leg.

When the spider dies, those valves all stay open. Normally, this would be a problem. But for necrobotics, it's perfect. With all valves open, pumping air into the prosoma extends all eight legs simultaneously, creating a perfectly synchronized gripper.

The beauty of the system is its simplicity:

• Increase pressure (puff air in) → legs extend → gripper opens

• Decrease pressure (release air) → flexor muscles take over → legs curl → gripper closes

No motors. No complex electronics. No batteries. Just pneumatics (air pressure) and natural muscle tension. The spider's own anatomy does all the work.

Potential Applications

Preston and Yap envision several uses for necrobotic grippers:

1. Microelectronics Assembly

Modern electronics are getting smaller and more complex. Assembling tiny components requires precise, delicate grippers. Traditional mechanical grippers are often too large, too clumsy, or too rigid for these tasks.

A spider's legs taper to extremely fine points and have natural compliance (they bend rather than break when encountering resistance). This makes them potentially ideal for picking up and placing tiny electronic components.

2. Scientific Fieldwork

One of the coolest applications is using necrobotic spiders to collect specimens in nature. Because the gripper is literally made from a spider, it naturally camouflages into the environment. It can capture small insects without damaging them (the spider's legs are designed to grab bugs gently).

Traditional sampling methods often injure or kill specimens. A necrobotic gripper could collect live insects for study while minimizing harm.

3. Sorting and Manipulation at Small Scales

Any repetitive task involving picking up and moving small objects could potentially use necrobotic grippers. Think about pharmaceutical manufacturing, seed sorting, or laboratory sample handling.

4. Research and Education

Even if necrobotic grippers never become commercially widespread, they're valuable for teaching principles of hydraulics, biomechanics, and creative problem-solving. The fact that a father-son duo in Australia successfully replicated the experiment in their backyard shows how accessible the technique is.

Why Use Dead Spiders Instead of Building Traditional Grippers?

This is the question everyone asks. If we can build robots, why use dead spiders? Several good reasons:

1. Nature Has Already Solved the Engineering Problems

Evolution has spent millions of years optimizing spider anatomy. Spider legs are incredibly strong relative to their weight, flexible enough to handle delicate tasks, and designed with joints that move smoothly without wearing out quickly.

Trying to replicate this artificially would require:

• Complex design work

• Expensive materials and manufacturing

• Numerous prototypes and iterations

• Sophisticated actuators and control systems

Or you could just use a spider, which already has all these features built in.

2. Environmental Benefits

Traditional robotic grippers contain plastics, metals, and electronics. When they break or become obsolete, they contribute to electronic waste (e-waste), which is a growing environmental problem.

Spiders are biodegradable. When a necrobotic gripper wears out, it can simply decompose. No toxic materials. No e-waste. It returns to nature.

3. Cost

Manufacturing precision mechanical grippers is expensive. Spiders are free. They're literally everywhere. You can find dead spiders without any effort. (Though harvesting them at scale would require figuring out ethical sourcing, which we'll discuss later.)

4. Performance

Dead spiders can grip objects heavier than themselves and perform delicate manipulations that would be difficult for traditional grippers of similar size. They work surprisingly well for their simplicity.

The Research Wins an Ig Nobel Prize

In 2023, Daniel Preston, Faye Yap, and three other team members (Anoop Rajappan, Zhen Liu, and Trevor Shimokusu) won an Ig Nobel Prize for their necrobotic research. The Ig Nobel Prizes are awarded annually for research that "first makes people laugh, then makes them think." They celebrate unusual or surprising science that captures public imagination while making genuine contributions to knowledge.

The necrobotics study was perfect Ig Nobel material. The initial reaction from most people is "That's ridiculous!" or "That's creepy!" followed quickly by "Wait, that's actually pretty clever" and "Huh, I never thought about spider hydraulics before."

The research also got a hilarious send-up on The Late Show with Stephen Colbert, bringing necrobotics to mainstream awareness.

But Preston and his team have taken the humorous reception in stride, using it as an opportunity to spark conversations about sustainable robotics and creative problem-solving.

Expanding the Field: Beyond Spiders

While the 2022 Rice University study focused on spiders, necrobotics as a concept is broader than that. It's about using any biological materials as robotic components.

In April 2025, researchers at Shinshu University in Japan created a "bio-hybrid drone" that used silk-worm moth antennae to detect the source of smells. The antennae, which are exquisitely sensitive to chemical signals, were incorporated into a drone that could track odors much better than artificial sensors.

In November 2025, researchers at McGill University demonstrated using a mosquito proboscis (the needle-like mouthpart mosquitoes use to pierce skin) as a fine nozzle in experimental 3D printing. The proboscis is naturally designed to penetrate precisely without causing excessive damage, making it potentially useful for printing at microscopic scales.

These examples show that necrobotics isn't just about spiders. It's about recognizing that biological structures, refined by millions of years of evolution, can sometimes outperform anything we can engineer from scratch.

The Ethical Questions

Not everyone is comfortable with necrobotics. The field raises several ethical questions worth considering:

1. Is It Okay to Use Dead Animals This Way?

Humans have been repurposing dead animals for millennia. We eat them. We make leather from their hides. We use bone and horn for tools and decorations. We make gelatin from their connective tissue. Museums display taxidermied specimens.

Proponents argue that using dead spiders for robotics is no different. We're using biological materials that are freely available (spiders die naturally) for beneficial purposes.

Opponents worry that normalizing the use of dead animals as robots could lead to a slippery slope. If we use spiders, what about mice? Monkeys? Where do we draw the line?

2. Should We Kill Spiders for This Purpose?

The Rice University research used spiders that died naturally. But if necrobotics becomes commercially viable, someone would need to supply spiders at scale. Would it be ethical to raise and euthanize spiders for robotics?

Some people are fine with this. We raise and euthanize billions of animals for food. Using them for scientific and engineering purposes might be justifiable if it reduces e-waste and advances technology. Others argue that killing animals for robotics crosses a moral line, especially if alternative technologies could work just as well.

3. Is This Disrespectful to Nature?

Some critics worry that necrobotics treats animals as mere tools rather than beings worthy of respect. They argue that we should admire and protect nature, not repurpose its creatures as machines.

Supporters counter that studying and using biological systems deepens our appreciation for nature. Learning how spiders work, how elegantly they're designed, inspires wonder and respect.

4. What About People With Arachnophobia?

A significant percentage of people have arachnophobia (fear of spiders). The idea of spider robots, even dead ones, is genuinely distressing to some people.

Preston acknowledges this: "We understand that many people are put off by the sight of a spider." But he argues that from an engineering perspective, spider mechanics are fascinating and warrant serious study.

The Team's Perspective

Preston emphasizes that despite appearances, they're not actually "reanimating" spiders. "Despite looking like it might have come back to life, we're certain that it's inanimate, and we're using it in this case strictly as a material derived from a once-living spider," he said.

The spider isn't coming back to life. There's no consciousness. No suffering. It's no different from using leather or any other biological material, except that the structure happens to be more intact and functional. The research has sparked important conversations about sustainable robotics, creative problem-solving, and how we can respectfully use biotic materials. And that's exactly what the team hoped for.

Future Directions

The Rice University team continues refining their necrobotic research. Current work includes:

Improving durability: The original spiders lasted about 1,000 cycles before degrading due to dehydration at the joints. The team is experimenting with polymeric coatings that could extend the lifespan significantly.

Individual leg control: Right now, all eight legs move together. Future work might allow control of individual legs, enabling more complex gripping patterns.

Testing different species: Smaller spiders can carry even more weight relative to their body size. The team wants to test whether tiny spiders make even better grippers.

Exploring other organisms: What other dead creatures might be useful? Insects? Crustaceans? The possibilities are surprisingly broad.

The Bottom Line

Necrobotics sounds like science fiction, but it's real science with legitimate applications. By repurposing dead spiders as robotic grippers, researchers have demonstrated that sometimes the best engineering solutions come from nature, not from trying to build everything from scratch.

The field raises important ethical questions about our relationship with animals, what counts as respectful use of biological materials, and where we should draw lines. These are conversations worth having. But it also shows the power of creative thinking. When Faye Yap saw a curled-up dead spider in 2019, she didn't just sweep it away. She asked "Why?" and "What if?" Those simple questions launched an entirely new field of research.

The next time you see a spider (dead or alive), maybe take a moment to appreciate what a marvel of engineering it is. Eight legs controlled by hydraulic pressure. Flexor muscles that naturally curl the legs. A body design so elegant that even after death, it can be repurposed as a functional tool.

Nature is full of brilliant designs. Sometimes the best innovations come from learning from life, even after that life has ended.

And yes, it's a little creepy. But it's also kind of amazing.

Sources

NPR. (2023). Why scientists are reanimating spider corpses for research. Retrieved from https://www.npr.org/2023/10/18/1198908301/necrobotics-reanimating-spiders-ig-nobel-prize

Rice University News. (2022). Rice engineers get a grip with 'necrobotic' spiders. Retrieved from https://news.rice.edu/news/2022/rice-engineers-get-grip-necrobotic-spiders

Rice University News. (2023). Preston, four others win Ig Nobel Prize for 'necrobotic' spider study. Retrieved from https://news.rice.edu/news/2023/preston-four-others-win-ig-nobel-prize-necrobotic-spider-study

Smithsonian Magazine. (2022). Scientists Use Dead Spiders as Claw Machines. Retrieved from https://www.smithsonianmag.com/smart-news/scientists-use-dead-spiders-to-grip-objects-180980498/

The Daily Beast. (2024). Scientists Create Necrobotics to Turn Dead Spiders Into Undead Zombie Robots. Retrieved from https://www.thedailybeast.com/scientists-create-necrobotics-to-turn-dead-spiders-into-undead-zombie-robots/

Wikipedia. (2025). Necrobotics. Retrieved from https://en.wikipedia.org/wiki/Necrobotics

Yap, T. F., Liu, Z., Rajappan, A., Shimokusu, T. J., & Preston, D. J. (2022). Necrobotics: Biotic Materials as Ready-to-Use Actuators. Advanced Science, 9(28), 2201174.