How many types of snakes are there? It’s hard to quantify with one final answer because it changes. The short answer is that currently, there are over 4,000 snake species on Earth, grouped into about 30 different families. Some families are further grouped into one of seven superfamilies. As scientists discover more types of snakes in secret corners of the earth and genetic research helps us classify them more accurately, the number is adjusted accordingly.
But to better understand what we’re talking about when we mention “snakes,” let’s dig into what a snake is and is not.
What is a Snake?
As part of the order Squamata, suborder Serpentes, snakes have scales that protect them from losing too much moisture in dry climates, help them gather water to drink, and serve as an additional protective layer between their skin and the environment.
Snakes are among nature’s most interesting animals. They have no functional legs but move silently through the brush faster than you expect a legless creature to move. Moreover, these animals are surprisingly fast! Some can move up to 12 miles per hour in sprints.
And eyelids? They’re missing those too. Instead, they have a transparent scale over their eyes. So, they never have to blink, and it gets replaced when they shed.
Shedding is another thing that snakes and lizards experience every so often. Their scales get beat up because they don’t constantly regenerate like a mammal. So, they periodically shed their skin and start fresh. In most lizards, it peels in pieces like a person with a sunburn. However, snakes usually shed in one piece, starting at the head!
We group them according to different features like venom, body type, number and type of scales, head type, etc. From there, the superfamilies break down into families and subfamilies. While we can’t discuss every snake in one article, we can cover a few of the most dangerous, common, and unique snakes. So let’s get started!
Most Common Types of Snakes
Worldwide, the most common snakes are usually nonvenomous because there are more nonvenomous snake species — it’s simple numbers!
North America’s most common snakes are those in the Thamnophis genus — garter and ribbon snakes. They’re almost as cold-adapted as the venomous European adder and often brumate together in massive groups. A few areas in western Canada have immense brumation dens where thousands of garter snakes spend the coldest months before coming out by the thousands to breed and feed.
In Europe, grass snakes (Natrix natrix) and European adders (Vipera berus) are widespread — grass snakes are harmless, but the adder is venomous. The adder is the only snake known to live above the Arctic Circle, and some females only breed every five years.
Once you arrive in Africa, however, you’re more likely to see venomous snakes — even though, like other regions, there aren’t as many venomous snake species. This continent has more sightings of dangerous puff adders than any other species. However, these highly venomous vipers spend most of their time in camouflage mode and only hiss or strike when their position is already compromised.
Asia and Southeast Asia have hundreds of snake species. However, the most common snakes are the harmless whipsnakes and ratsnakes. The region also has numerous venomous snakes, including several vipers, cobras, and kraits.
Australia’s most common snake is the nonvenomous carpet python, followed closely by the venomous red-bellied black snake.
Most Venomous Snakes in the World
Scared yet? Don’t be.
Only about 600 have any venom at all, and of those, only about 200 can kill a person. That’s right, of the 4,000-plus snakes around the world, only about 200 can kill you. Now, you might be concerned if you live where some of the more dangerous snakes also live. However, most snakes try to avoid people. So, the real lesson is how to identify and avoid the snakes.
Most dangerously venomous snakes worldwide are those in the Elapidae and Viperidae families. Still, there are also a few in other families.
Venomous snakes have fangs attached to venom glands. Some fangs are small but hollow and fixed in the front of the mouth; some are primitive and only have a groove for the venom to flow along. Still others, like the vipers, have incredibly advanced venom delivery systems with long, hollow, hinged fangs that inject massive quantities of venom.
Elapids
Among the most dangerous snakes, the elapids are a diverse family with members across most of the temperate world. However, some areas, like Australia, have more than their fair share of deadly snakes. Here, you’ll find several deadliest snakes in the world, like the eastern brownsnake (unrelated to the harmless Dekay’s brownsnake in North America), inland taipan, and four death adders — they’re all elapids!
Cobras
Originally called cobras di cappelo by Portuguese sailors, several hooded elapids get lumped together as cobras. They’re widespread and live in Africa, the Indian subcontinent, Asia, and Southeast Asia. These hooded serpents are dangerous, and the Indian cobra is one of the Big Four of Indian snakebite infamy. There are over 20 species of these deadly snakes.
Giant Spitting Cobra — The Biggest Spitting Cobra
Yes, there’s a giant cobra that can accurately spit venom at you. Also called Ashe’s spitting cobra (Naja ashei), this snake is big and burly. It can grow up to eight and a half feet long and spit its venom up to eight feet. This cobra is closely related to forest cobras and Mozambique spitting cobras.
Giant spitting cobras are native to eastern Africa, and do not hesitate to spew venom! They’re known for spitting at anything they perceive as a threat for a long time.
King Cobra — The Longest Venomous Snake Isn’t a True Cobra
Another huge venomous snake, the king cobra, is in a class of its own. Really! It’s the only member of its genus, Ophiophagus. While it used to be included in the Naja genus with the other cobras, recent research showed that it didn’t belong there.
King cobras are the longest venomous snakes in the world. The record was just a little over 18 feet long. In collections, they’re known for being far more intelligent than other snakes and being more likely to attempt an escape.
Native to parts of India and much of Southeast Asia, king cobras get their name from the fact that they eat other snakes. Big snakes, little snakes, they don’t care. They’re also the only snake to build a nest for their eggs and guard them until hatching.
Coral Snakes
There are coral snakes in many regions worldwide. Scientists separate them by the New World coral snakes and Old World coral snakes. They’re all highly venomous, and only those in North America mostly follow the old rhyme “Red touch yellow, kill a fellow; red touch black, venom lack” and its variants. Herpetologists discourage its use because the rhyme fails when you find a snake with an aberrant (color mutation) pattern.
In any case, coral snakes come in many colors and patterns, from all black with a blue head to the cliché red, yellow, and black. Most species are relatively small, don’t exceed three feet long, and aren’t inclined to bite. However, with hundreds of species worldwide, you’ll find some that are only too happy to take a bite.
Stiletto Snakes (Atractaspis spp.) — Weirdest Fangs
Part of a subfamily that’s related to cobras and yet not related, stiletto snakes have been moved repeatedly from one family to another. They’re currently the nominate subfamily in the Atractaspidinae family and will probably be there for a while.
These dangerous snakes can’t be handled safely. It doesn’t matter how you hold them. They’ve got fangs that they move independently to stick out of the side of their mouth and stab sideways. According to the African Snakebite Institute, stiletto snakes (Atractaspis bibronii) are responsible for the third-most serious snakebites in South Africa, after the Mozambique spitting cobra and puff adder.
Stiletto snakes are small and fossorial and try to avoid people — they rarely measure more than 18 inches. But, because they resemble harmless snakes, people pick them up with their hands and get stabbed because these snakes don’t hesitate to use their freakish fangs against any threat.
Unfortunately, there is no antivenom for stiletto snake venom. Happily, there also aren’t any recorded deaths, but many victims lose digits.
Types of Vipers — True Vipers and Pit Vipers (Viperinae and Crotalinae)
The Viperidae family holds some of the world’s most dangerous snakes. If you live anywhere they’re found, you need to know what types of venomous snakes occur and how to tell them from harmless snakes. For example, two of India’s Big Four venomous snakes are the saw-scaled viper and Russel’s viper. These two vipers are responsible for more snakebite deaths than any other vipers combined. The high fatality rate is partly because of their venom’s toxicity; but also partly because medical care in the countries they inhabit isn’t as easily accessible.
European Adder (Vipera berus) — Most Common Venomous Snake in Europe
The most cold-tolerant snake known to science, the common European adder is the only snake to live north of the Arctic Circle. It’s also venomous — fortunately, there are very few deaths on record, and antivenom (when it’s needed) is effective.
You’ll know this smallish viper by its distinctive zig-zag pattern on its back. There are a few melanistic snakes that become almost black — they’re almost always female. Because of the cold environments they inhabit, these snakes never get all that large, nor do they breed all that often. Some females are as old as seven or eight before they breed for the first time, and often go five years between breeding cycles.
Bushmaster (Lachesis muta) — Longest Venomous Snake in the New World
Among the most dangerous snakes in South America, the bushmaster’s scientific name means silent death. In fairness, it’s not prone to biting, but when it does bite, it does so repeatedly. However, because it’s a pit viper in the Crotalinae subfamily with its close cousins the rattlesnakes, the “silent death” moniker fits — it has no rattle and death from this snake is more common than others.
Also, in an apparent bid to be the biggest and the baddest of all the pit vipers, it can reach 12 feet long, although eight is more frequent; making the South American bushmaster the longest venomous snake in the New World. Like all other pit vipers, it has heat-sensing pits in its loreal scales, located between its nostril and its eye.
However, this snake’s rebellious streak doesn’t end with its size. It also decided that giving birth was too much trouble and instead lays eggs — unlike nearly every other pit viper.
Typical Snakes (Colubridae)
One thing that you need to know about snakes is that approximately one-half of the world’s snakes don’t fit neatly into their own groups like boas and pythons. Instead, those snakes find themselves in the Colubridae family. Here, you’ll find everything from deadly boomslangs to harmless kingsnakes and water snakes.
Types of Water Snakes
When you say “water snake,” what comes to mind? It likely depends on where you live! For example, if you live in the eastern United States, you may think of banded watersnakes and cottonmouths. However, if you’re in Southeast Asia, perhaps a tentacled snake comes to mind instead.
Water snakes are in nearly as many regions as their dry-land-loving counterparts. Some never come to land and others are only semiaquatic and split their time between the land and the water.
Most of the world’s harmless water snakes are in the Colubridae subfamily of Natricinae. That’s where you’ll find grass snakes, garter snakes, water snakes, and many others.
Keelbacks — Poisonous and Venomous
The keelbacks of the Rhabdophis genus are an interesting snake group. They’re part of the Natricinae subfamily, but aren’t terribly aquatic. Some are venomous — there are a few records of dangerous envenomations with the Japanese keelbacks. However, most are harmless to people.
But some of these snakes are indeed poisonous — not just venomous. It’s rare in the snake world, and there’s discussion about North American hognose snakes also being poisonous. However, it’s not definitive. Keelbacks become poisonous because they absorb the toxins from their toad-prey and are able to circulate it through their bodies.
The difference between poisonous and venomous is specific. It’s not subtle. Here it is: Poison is a substance that makes you sick or kills you when you ingest or absorb it. Venom has to be injected for it to have any effect, but you can usually eat it without harm.
Keelbacks are semiaquatic toad eaters native to Southeast Asia.
Water Snakes
In North America, snakes in the Nerodia genus are considered water snakes. Everything else is, well, not. They can be great swimmers and semiaquatic, but they’re still not water snakes.
This genus includes 10 different species plus several subspecies. They’re common in the eastern United States and spend most of their active time in or near permanent water sources. Nerodia water snakes are exceptionally skilled in catching fish and amphibians, their primary food sources.
Typically, these water snakes are heavy-bodied and have keeled scales. They don’t lay eggs but give birth to babies in the summer. These water snakes aren’t venomous but have wicked teeth they use to catch prey. Unfortunately, those same teeth are their primary defense weapon, which water snakes are only too willing to use.
Grass and Garter Snakes
These snakes share many physical similarities but live in entirely different parts of the world.
Natrix genus grass snakes are mainly European, while Thamnophis genus garter snakes are North American.
Both groups (genera) have thin bodies and live in and near water. Their diets are mainly amphibians, but while garter snakes give birth to their babies, grass snakes lay eggs.
Constrictors — Boas and Pythons
Although once lumped into one family, boas and pythons are spread across three families. These snakes are all nonvenomous, and some have vestigial limbs — the remnants of their evolution from lizards.
Boas are mostly confined to the new world and a few locations like Madagascar and pockets of Africa. On the other hand, pythons are widespread across Africa, Asia, Southeast Asia, and Australia. The families include some of the biggest snakes, including the longest and the heaviest species.
Green Anaconda — Heaviest Snake in the World
The title of “Heaviest Snake” goes to the green anaconda (Eunectes murinus). It’s a boa, it’s a watersnake, and it’s enormous. It is the heaviest snake in the world at up to 550 pounds and 20-plus feet long for females.
However, green anacondas aren’t the only anaconda. There are three other species, but they’re all much smaller. Here are the other extant (living) species:
- Bolivian anaconda (E. beniensis)
- Yellow anaconda (E. notaeus)
- Dark spotted anaconda (E. deschauenseei)
Reticulated Python — The Longest Snake
Reticulated pythons, or retics as many owners call them, are native to South and Southeast Asia. They’re incredible swimmers and some of the region’s first animals to colonize new volcanic islands. These snakes get their common and scientific name from their color pattern — which has a net-like appearance.
They regularly attain lengths of 20 feet and more. The record was said to be 28 feet long, but there are questions about how the measurements were performed. We know the longest reliable retic is one named Medusa, who lives with her owner in Kansas City, Missouri.
Smallest Boas — Sort of
Technically, the boas in the Tropidophiidae family aren’t truly boas, but they look like boas — so that’s what we call them. The exciting thing about these tiny boa-like snakes is that a new-to-science species was described in 2022.
Tropidophis cacuangoae is native to Ecuador, a location with no others in the genus, and the individuals they found were only a foot long!
A gross but interesting fact is that they curl up into a ball and bleed from their eyes when threatened. When the threat leaves, they uncurl and slither away like nothing ever happened.
Weird Snakes — Tentacled, Flying, and Elephant Trunk Snakes
No matter where they’re grouped, some snakes are just weird. Quite a few snakes adapted to unusual circumstances with equally unique solutions. Although most technically belong to the Colubridae family, it’s hard to see that when they’re so different!
Flying Snakes (Chrysopelea spp.)
This colubrid is mildly venomous and not generally considered dangerous to people. However, despite its obvious lack of wings, it glides better than a flying squirrel! Found mainly in Southeast Asia, flying snakes in the Chrysopelea genus form a type of wing by flattening their ribs and sucking in their gut as they leap from the trees.
Elephant Trunk Snakes (Acrochordidae)
Their name really says it all. Snakes in this family have loose, baggy skin that looks oddly similar to an elephant trunk — or a snake with skin two sizes too big. These snakes are completely aquatic and don’t have wide belly scales that allow other snakes to move along the ground.
Instead, elephant trunk snakes have tiny pyramid-shaped scales that feel rough to the touch, which is why they’re also called Javan file snakes. They eat mainly fish and other small animals in the water and are native to Southeast Asia.
Tentacle Snakes (Erpaton tentaculum)
Another fully aquatic species, tentacled snakes spend their entire lives underwater — even their babies are born underwater. They’re so well adapted that they even look like moss-covered branches. Tentacle snakes are native to Cambodia, Vietnam, and Thailand.
They’re only a couple of feet long and have tentacles that come out of their snout. Unlike an octopus, tentacle snakes can’t grab things with them, but some scientists think they could be an extension of their senses. These snakes have an uncanny ability to know exactly where a fish’s head is going to be and strikes there instead of where it is at the moment.
Types of Snakes Chart
With over 4,000 snake species worldwide, there is endless variety! Just when you think you’ve seen a lot, you find yet another fascinating snake that you have to know about. Here are some of the coolest, weirdest, or most common types of snakes you need to know about.
Type of Snake | Where it Lives | Venomous or Dangerous? |
---|---|---|
Giant Spitting Cobra | Africa to Southeast Asia | Highly venomous |
King Cobras | Southeast Asia | Highly venomous |
New World Coral Snakes | North, Central, & South America | Highly venomous but usually shy |
Old World Coral Snakes | Mostly Southeast Asia | Extremely venomous |
Stiletto Snakes | Africa and Arabian Peninsula | Venomous! Many people are bitten by these snakes every year. |
Common Adder | Europe | Venomous, but most bites aren’t deadly |
South American Bushmaster | South America | Deadly! |
Water snakes | Southeastern United States | Harmless but have sharp teeth |
Grass snakes | Eurasia | Harmless |
Garter snakes | North America | Harmless but some have mild venom |
Green anaconda | South America | Not venomous, but their size makes them dangerous to people and pets. |
Reticulated python | Southeast Asia | Not venomous but can be dangerous to pets and people because of their size. |
Dwarf boas (Tropidophis spp.) | Central and South America | Harmless, but their bloody eyeball defense is creepy. |
Flying snakes | Mainly Southeast Asia | Harmless |
Elephant trunk snake | Southeast Asia | Harmless |
Tentacle snake | Cambodia, Thailand, and Vietnam | Harmless |
Different Types of Snakes List:
The photo featured at the top of this post is © Artem Onoprienko/Shutterstock.com
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