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The viral “walking snake” story is real, but the headline overstates what happened. Engineer and YouTuber Allen Pan built a four-legged robotic exoskeleton and showed a snake moving inside it. The machine supplied the legs; the snake did not regrow, biologically control or evolve new ones. It was a brief DIY robotics demonstration, not a veterinary prosthesis or proof that modern snakes can walk.
Who built the robotic legs?
Allen Pan, an American engineer and YouTube inventor, published a video in August 2022 titled “giving snakes there legs back”—with “there” apparently used instead of “their.” News reports identify Pan as a snake enthusiast and inventor, not as a veterinary prosthetics specialist or academic snake researcher. The video’s playful premise was to give a snake an external version of limbs that some ancient snakes once possessed.
The original report appeared on August 17, 2022, in Tech Times. A separate account from Jacaranda FM also describes the four-legged suit and the resulting walking-like movement.
What did Pan actually build?
The apparatus was an external robotic carrier or exoskeleton rather than a conventional prosthetic limb. Reported features include:
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- Walking Support: Supports natural walking, eases knee and ankle pressure, boosts balance, gravity-powered pendulum system enables seamless, battery-free gait with energy-saving support
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- Four motorized legs—two at the front and two at the rear.
- A long, transparent tube or body channel through which the snake could enter and leave.
- A “2.0” version of the design.
- A layout influenced partly by lizard limbs, including the Western three-toed skink.
The tube appears to have guided the snake’s elongated body and kept it aligned with the frame without attaching rigid hardware directly to the animal. That is an important distinction: a prosthesis normally replaces or assists a missing body part, while this device placed the animal inside a machine that generated movement from outside its body. The design details are reported by Tech Times, Jacaranda FM and Popular Science.
Did the snake really walk?
The video shows a snake moving while inside or connected to the robotic apparatus, and coverage describes the result as walking or strutting on four mechanical legs. The more precise description is that the machine produced walking-like movement with a snake in it.
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- 31-MILE EXTENDED RANGE: Dual removable batteries provide up to 31 miles of tested assistance range, giving you reliable power support for longer outdoor activities. The portable battery design allows you to carry spare power wherever you go, while fast charging in under 80 minutes helps minimize downtime. Swap batteries easily to keep moving. Single battery provides up to 15.5 miles of assistance range under test conditions. Actual range varies based on assist level, terrain, and usage conditions.
| What the demonstration shows | What it does not establish |
|---|---|
| A lightweight frame can move a snake in a four-legged, walking-like pattern. | The snake biologically regained legs or developed a quadrupedal gait. |
| The device supplied the mechanical limbs and their motion. | The snake controlled artificial joints through its nervous system. |
| The animal entered and moved through the apparatus during a short demonstration. | Long-term adaptation, repeatable gait performance or medical benefit. |
No controlled laboratory study, peer-reviewed gait analysis or long-term veterinary assessment is reported in the available coverage. The demonstration therefore cannot show that snakes can “walk again” in a biological sense.
Was it Pan’s pet snake?
The assignment’s headline calls the animal a pet, but the reporting is not consistent enough to establish ownership. Accounts say Pan visited a pet store to study lizards and then worked with a snake breeder or handler to test the device. The safest wording is that Pan tested the suit on a snake. Unless the original video or a first-party statement confirms ownership, calling it his personal pet goes beyond the evidence.
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Did snakes ever have legs?
There is a real evolutionary question behind the joke. Snakes are highly modified lizards, and fossils show that some early snakes retained hind limbs and a pelvis. A landmark 2019 study of Najash described a true snake with substantial hind limbs and concluded that snake evolution involved several stages of limb reduction. The intermediate condition—no forelimbs but reduced hind limbs—could itself be a stable and successful body plan, not merely a fleeting step toward modern snakes. See the peer-reviewed study at PMC.
PBS’s evolutionary coverage likewise presents Najash as a snake with two hind legs while noting that fossil snakes had different combinations of traits: The Great Snake Debate.
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- 【Material】The metal parts of the bionic walking aid are made of high-quality aluminum alloy, and the knee support strap is made of adjustable and comfortable
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What about a four-legged snake?
Claims about a fully four-legged snake ancestor are more complicated. A fossil once promoted as the four-legged snake Tetrapodophis was later argued by researchers to be a lizard. That dispute means it is not accurate to state that scientists have conclusively found a normal four-legged snake ancestor. What is firmly supported is the existence of ancient snakes with hind limbs, especially Najash.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why did modern snakes lose visible limbs?
Evolution did not “break” snakes and leave them waiting for replacement legs. Limblessness became part of a successful body plan. A long, narrow body can be advantageous for moving through confined spaces and for the specialized forms of locomotion used by snakes. Limb reduction happened over evolutionary time and appears to have involved multiple anatomical changes, including earlier loss of forelimbs and later reduction of the pelvis and hind limbs.
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In the video, Pan also discussed a proposed developmental relationship between pathways involved in hind-limb formation and the development of male snake reproductive structures called hemipenes. That is an explanation attributed to Pan’s presentation, not evidence that snake legs literally “became two penises.”
Is the device useful or safe for a snake?
No available report establishes a medical, behavioral or evolutionary benefit. The machine was not presented as an approved veterinary device or as treatment for a documented disability. A snake’s willingness to enter a tube, or its movement once inside, does not by itself demonstrate comfort or welfare.
A responsible assessment would require, at minimum:
- Veterinary review and a species- and size-specific fit.
- Monitoring for stress, pressure, friction, heat and restricted movement.
- Strict duration limits and a reliable immediate-release mechanism.
- Observation after removal for injury or abnormal behavior.
- Repeated trials rather than a single entertaining clip.
The apparatus also presents engineering challenges. A snake has a flexible, elongated body rather than a rigid torso with shoulder and hip joints. Alignment, traction, balance and drag through the tube all matter, and a design suitable for one animal cannot automatically be generalized to boas, pythons, colubrids or other species. These are reasons for caution, not evidence that the demonstration caused an injury; the available reporting does not document a welfare outcome.
What the video actually proves
- Pan built a functioning external robotic frame with four legs.
- A snake was shown moving in that frame in a walking-like way.
- Ancient snakes, including Najash, really did possess hind limbs.
- The experiment does not show biological restoration, neural control of prosthetic legs, improved health or a useful veterinary treatment.
In short, Pan did not give a snake its biological legs back. He built a machine that let a snake try a mechanically imposed, walking-like form of movement, using a genuine evolutionary question as the premise for a playful engineering experiment.
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