Snakes raise more questions than almost any other group of animals.
Can snakes hear? Can they smell? Why do they constantly flick their tongues? Can they see in the dark? Do snakes chase humans? And are baby snakes really more venomous than adults?
Some of these questions have straightforward answers. Others are more complicated because snakes are an incredibly diverse group, with thousands of species adapted to deserts, mountains, forests, wetlands, rivers and oceans.
Here are 18 of the most common—and most interesting—questions people ask about snakes.
1. Can snakes hear?
Yes. Snakes can hear, but not in exactly the same way humans do.
Snakes do not have visible external ears, but they do have inner-ear structures capable of detecting vibrations and sound.
They are particularly sensitive to vibrations travelling through the ground. Movement from footsteps, animals or other disturbances can pass through the ground and ultimately reach the snake's inner ear.
Snakes can also detect some airborne sounds, particularly lower frequencies.
So saying that snakes are completely deaf is incorrect.
Their world of sound is simply very different from ours.
2. Can snakes smell?
Yes—and chemical detection is one of their most important senses.
Snakes use their nostrils for conventional smell, but they also have another highly developed system involving the tongue and the vomeronasal, or Jacobson's, organs.
When a snake flicks its tongue, it collects microscopic chemical particles from its surroundings.
Those particles are then transferred to specialized sensory organs in the roof of the mouth.
This helps the snake detect prey, predators, potential mates and chemical trails left by other animals.
For a snake, the environment contains an entire chemical landscape that humans cannot perceive.
3. Why do snakes stick out their tongues?
A snake sticking out its tongue is usually collecting information about its surroundings.
The tongue gathers chemical particles from the air, ground and nearby objects.
When the tongue returns inside the mouth, those particles are analyzed by the snake's vomeronasal system.
So when a snake repeatedly flicks its tongue toward you, it does not necessarily mean it is preparing to attack.
It is more likely trying to understand:
What are you? Where are you? What is happening around me?
4. Why are snake tongues forked?
The forked tongue helps snakes determine direction.
Each side of the fork collects chemical information from a slightly different position.
If one side detects a stronger chemical concentration than the other, the snake can use that difference to help determine where the scent trail is coming from.
In simple terms:
The forked tongue helps turn smell into direction.
This is especially useful when following prey, locating mates or navigating through complex environments.
5. Can snakes see in the dark?
Not exactly.
Snake eyes still require light.
However, many nocturnal snakes have eyes adapted to perform very well under low-light conditions.
Some snakes also possess another remarkable sensory system.
Pit vipers, as well as some boas and pythons, have specialized heat-sensitive organs capable of detecting infrared radiation produced by warm animals.
These organs allow them to detect temperature differences between prey and the surrounding environment.
This is sometimes described as thermal vision, although technically it is a separate sensory system from ordinary eyesight.
A snake therefore does not necessarily need to see an animal clearly to know that something warm is nearby.
6. Do snakes chase humans?
Generally, no.
Snakes do not normally consider humans prey.
When confronted by something as large as a person, most snakes attempt to:
remain motionless,
hide,
escape,
or defend themselves if they feel trapped.
Sometimes a snake's escape direction happens to be toward a person.
If that person moves again and unintentionally blocks the snake's escape route, it can create the impression that the snake is following or chasing them.
Defensive snakes can certainly move toward a perceived threat under some circumstances, but deliberate prolonged pursuit of humans is not normal snake behaviour.
The best response is simple:
Give the snake space and allow it an escape route.
7. Can snakes climb walls?
Some snakes can climb some walls extremely well.
Whether a snake can climb a wall depends on both the species and the surface.
Rough stone, brickwork, cracks, ledges, pipes and irregular surfaces provide snakes with points against which they can brace their bodies.
Some climbing and arboreal snakes are particularly skilled at using these surfaces.
A perfectly smooth vertical wall is much more difficult.
So the correct answer is not simply:
“Snakes can climb walls.”
It is:
Some snakes can climb certain walls surprisingly well.
8. How far can a snake strike?
There is no universal strike-distance rule.
You may hear statements such as:
“A snake can strike one-third of its body length.”
Or:
“A snake can strike half its body length.”
These can be rough generalizations, but they should not be treated as reliable safety formulas.
Strike distance can depend on:
species,
body position,
body size,
motivation,
terrain,
and whether the strike is defensive or directed toward prey.
A snake may also move forward while striking.
For this reason, you should never calculate how close you can safely approach a venomous snake based on estimated strike distance.
Give the snake space instead of testing its limits.
9. Are baby snakes more venomous than adults?
Not as a general rule.
The idea that baby snakes are automatically more venomous or more dangerous than adults is one of the most common snake myths.
Venom composition can change as a snake grows.
Juveniles and adults may hunt different prey, and their venom chemistry may therefore differ.
In some species, juvenile venom may perform more strongly in certain biological tests.
In others, adult venom may be more potent in particular ways.
Adults also generally have larger venom glands and are capable of delivering larger quantities of venom.
So the more accurate answer is:
Snake venom can change throughout the animal's life, but baby snakes are not universally more venomous than adults.
Any bite from a medically significant venomous snake should be taken seriously.
10. Why do snakes shed their skin?
Snakes shed their skin through a process called ecdysis.
As the animal grows and its skin experiences wear, a new outer layer develops beneath the old one.
The old skin gradually separates.
Eventually, the snake begins rubbing against rocks, vegetation or other surfaces and pulls itself through the loosened skin.
A healthy shed may come away almost completely intact.
The shed can even preserve details such as:
scales,
eye caps,
belly scales,
and sometimes patterns in the skin.
Shedding is therefore not simply because the snake has “outgrown” its skin.
It is also part of the normal renewal of the animal's outer body surface.
11. Why do some snakes have vertical pupils?
Vertical pupils are often associated with nocturnal activity and ambush predation.
They allow the eye to control incoming light over a wide range of conditions, which can be useful for animals operating in both relatively bright and very dim environments.
But pupil shape should never be used to determine whether a snake is venomous.
Some venomous snakes have vertical pupils.
Others have round pupils.
Many harmless snakes also have vertical pupils.
Pupil shape tells us something about the snake's ecology—not whether it is dangerous.
12. Why do snakes hiss?
Hissing is primarily a warning signal.
A snake produces the sound by forcefully moving air through its respiratory system.
The message is essentially:
I know you are here. Do not come closer.
Different snake species produce very different defensive displays.
Some hiss loudly.
Others inflate their bodies, flatten their necks, raise their heads, vibrate their tails or strike.
When a snake begins hissing, it is telling you something important:
Your presence has already affected its behaviour.
That is usually a good reason to increase the distance between you and the animal.
13. Can snakes swim?
Yes. Many snakes are excellent swimmers.
Snakes generally swim by moving their bodies from side to side, creating waves that push against the water.
Some species only enter water occasionally.
Others are strongly associated with wetlands, rivers, mangroves or coastal environments.
Sea snakes have taken this adaptation much further and spend most or all of their lives in marine environments.
Seeing a snake swimming does not automatically mean it is an aquatic species.
Sometimes water is simply another route through its habitat.
14. Do snakes drink water?
Yes.
Although snakes receive some moisture from their prey, many species also drink water directly.
They may drink from:
pools,
puddles,
streams,
rainwater,
dew,
or droplets collecting on vegetation and rocks.
Even sea snakes can depend on freshwater.
Despite spending their lives surrounded by seawater, some species drink freshwater that forms temporarily on the ocean surface after rainfall.
Living in water does not necessarily mean an animal can drink that water.
15. How long can snakes go without eating?
Sometimes a surprisingly long time.
There is no single answer because fasting tolerance depends on:
species,
size,
age,
health,
temperature,
activity level,
and previous feeding history.
Many snakes have relatively low metabolic requirements compared with mammals.
Some species are adapted to consuming large meals and then spending long periods without eating again.
Under certain conditions, snakes can survive for weeks or even months between meals.
That does not mean snakes do not need food.
It means their physiology is adapted to a world where prey may be unpredictable.
16. Why do snakes bask in the sun?
Snakes are ectothermic.
Their body temperature is strongly influenced by the temperature of their surroundings.
Basking allows a snake to warm itself when necessary.
Temperature affects many important processes, including:
movement,
digestion,
metabolism,
reproduction,
and immune function.
But snakes do not simply try to become as hot as possible.
They continually move between warmer and cooler locations to keep their body within a useful temperature range.
A snake sitting in sunlight may therefore be doing something essential:
Regulating its own body temperature through behaviour.
17. Why are some snakes active at night?
For many snakes, nighttime provides better conditions.
This is especially important in hot desert environments.
During the day, exposed rocks and sand may reach temperatures that make surface activity difficult or dangerous.
After sunset, temperatures fall.
Snakes can then emerge to:
hunt,
search for mates,
move between shelters,
drink,
or explore their territory.
Night activity may also match the activity patterns of their prey.
This is one reason night herping can reveal an entirely different side of an environment.
The landscape was never empty during the day.
Its wildlife was simply following a different schedule.
18. Why do some vipers have black tongues while others have red tongues?
This is one of the more unusual snake questions—and one for which science does not yet provide a simple universal explanation.
Snake tongues are not always black.
Depending on the species, they can appear:
black,
dark grey,
brown,
pink,
red,
pale,
partially pigmented,
or even patterned with several colours.
Much of this difference comes from pigmentation, particularly variations in the amount and distribution of melanin.
A heavily pigmented tongue may appear black or very dark.
A tongue with less dark pigmentation may appear pink, reddish or pale.
Some species can even show more than one colour on the same tongue.
What is much less certain is why these different tongue colours evolved.
Tongue colour may reflect ancestry, species-specific pigmentation patterns or developmental differences, but there is currently no good evidence that a black tongue automatically gives one viper an advantage over a red- or pink-tongued species.
Tongue colour also does not tell us:
how venomous the snake is,
how aggressive it is,
or how dangerous it might be.
Sometimes animal anatomy gives us an immediate ecological explanation.
Sometimes it tells us something about evolution.
And sometimes the correct answer is simply:
We do not completely know yet.
That uncertainty is part of what makes snakes so fascinating.
Understanding Snakes Means Replacing Myths With Biology
Snakes have accumulated an extraordinary number of myths.
They are described as deaf animals that somehow detect every footstep, predators that chase humans, creatures that smell entirely with their tongues, or animals capable of seeing perfectly in complete darkness.
The real biology is far more interesting.
Snakes experience their surroundings through a combination of vision, chemical detection, vibration, hearing, temperature and physical contact.
Their senses are not inferior versions of ours.
They are adaptations to a completely different way of experiencing the world.
And the more we understand how snakes actually behave, the less mysterious many of their actions become.
Understanding wildlife is often the first step toward respecting it.
