October 8, 2026, 7:11 am | Read time: 4 minutes
Many are familiar with the symbol of the snake biting its own tail–the so-called Ouroboros. While it appears to be a mystical motif, it actually occurs in reality. However, there’s no mystery behind it, but often a problem: When snakes attack themselves, it’s usually a sign of stress, overheating, or confusion. PETBOOK editor and biologist Saskia Schneider explains why this behavior occurs and what owners should do in such cases.
The Mystery of the Ouroboros
A snake biting its own tail–almost everyone knows this image. As the so-called Ouroboros, it appears as early as antiquity, such as in ancient Egypt. It represents eternity, rebirth, and the cycle of life.
But contrary to popular belief, it’s not just symbolism. This behavior also occurs in reality–albeit rarely. And when an owner suddenly observes their own snake doing this, it can be quite disturbing.
The good news: There’s no “mystical” behavior behind it. The less good news: It’s often a warning signal.
Why Do Snakes Bite Their Own Tail?
When a snake attacks its own body, it’s not normal behavior from a biological perspective. However, there are several plausible explanations–and they usually involve stress, captivity, or confusion. This behavior is primarily observed in snakes in captivity. In the wild, it occurs much less frequently. 1, 2
Overheating–a Common Trigger
Snakes are cold-blooded. This means their body temperature is entirely dependent on the environment. If the terrarium gets too warm, their metabolism can increase significantly. The animals then suddenly appear “hungry”–even if they aren’t. At the same time, they can become disoriented. In the worst case, they mistake their own tail for prey.
Stress and Overwhelm
Stress is a central factor. Terrariums that are too small, lack of retreat options, or constant disturbances can lead snakes to react unusually–such as with uncoordinated biting movements.
Mistaken for Prey
Snakes have an extremely strong feeding reflex. Especially species that eat other snakes can simply make a mistake. It sounds trivial, but it’s actually one of the most plausible explanations: They don’t “think” for long but react quickly to movements.
Illness or Pain
In some cases, there’s more behind it. Animals that are severely weakened or sick can also start biting themselves. This is then a serious warning signal.
These Snake Species Are More Often Affected
Videos of snakes eating themselves circulate repeatedly. The most famous example is a YouTube video from 2014 showing a Western hognose snake biting its own tail and continuing to swallow its body while blood dripped from its jaw. Several media outlets covered the case–including the “Daily Mail.”
Often, these are isolated cases–yet there are some snake species where this behavior is said to occur more frequently. Among them are colubrids and cobras. Both belong to species that eat other snakes or even smaller conspecifics. Here, a “mistake” can occur, especially when the animals are under hunger stress.3
How to Release the Snake Bite
Since this behavior primarily occurs in snakes in captivity, snake owners occasionally face this situation. The problem is: Once the snake has “bitten,” it often struggles to release–its jaw is designed to hold onto prey. In the worst case, this behavior can even be fatal.
In forums and on social media, snake owners exchange various tips on this. One suggestion is to apply a small amount of hand sanitizer or alcohol to the animal’s mouth. Many snakes then abruptly release the bite. However, alcohol or sanitizer can also be toxic to snakes. But if it’s about saving an animal’s life, it’s worth a try.
If the tail cannot be released or is already further into the mouth, you should not waste time and consult a veterinarian.
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When to See a Veterinarian?
Usually, this behavior occurs rarely. However, there are cases where snakes repeatedly attack their tail. In these instances, the behavior should definitely be clarified.
You should definitely see a veterinarian if:4
- the snake does not release on its own
- parts have already been swallowed
- wounds or blood are visible
- the animal appears apathetic or unusual
A veterinarian knowledgeable in reptiles can carefully release the jaw, treat wounds, and clarify the cause.
Conclusion
As fascinating as the image of the Ouroboros is–in reality, it has little to do with mythology. When a snake bites itself, it’s almost always an alarm signal.
Usually, stress, captivity errors, or health issues are behind it. For owners, this means: pay close attention, react quickly–and critically review the living conditions.