Venomous Snakes of Maryland

There are 27 different snakes in Maryland. Out of these, there are 2 types of venomous snakes. These are the Eastern Copperhead and the Timber Rattlesnake. In this article, we will talk about each of these venomous snakes. We will also describe each snake. Then, we will tell you where you will likely find them in Maryland.

• Eastern Copperhead (Agkistrodon Contortrix)
• Timber Rattlesnake (Crotalus horridus)

The Nongame and Endangered Species Conservation Act protects all snake species in Maryland. Source

Pit Vipers

Rattlesnakes, Copperheads, and Cottonmouths belong to the venomous Viperidae or viper family. Another name for these snakes is pit vipers. Pit vipers have heat-sensing pits between their nostrils and eyes. These pits are actually specialized organs that detect infrared radiation from prey animals. Pit organs enable pit vipers to strike their prey precisely, even in the dark. They are also able to detect body heat from about 1 meter away.

Pit vipers have hollow fangs connected to venom glands. They use their fangs to inject venom into their prey. This venom immobilizes their small prey, making it easier for the snake to consume. They primarily consume small mammals, reptiles, amphibians, and small birds. These snakes play vital roles in maintaining balance in rodent populations.

Eastern Copperhead

Scientific Name:	Agkistrodon contortrix
Description:	Adult copperheads are 20 to 37 inches (50 to 95 cm) long. Their bodies are coppery brown overlayed with dark brown hourglass blotches.
Habitat:	Deciduous forests, river bottoms, and rocky wooded hillsides.
Conservation Status:	Common throughout the state of Maryland.

Eastern Copperheads are pit vipers native to the eastern United States. Maryland was formerly home to the Northern Copperhead subspecies. However, DNA analysis shows little genetic difference between the two. Today, the former Northern Copperheads, Southern Copperheads, and Osage Copperheads are taxonomically combined. The common name for these snakes is Eastern Copperheads. Their scientific name is Agkistrodon contortrix. Source

Copperheads are stout heavy-bodied snakes. Adult copperheads are 20 to 37 inches (50 to 95 cm) long.

Eastern Copperhead snakes have reddish-tan to grayish-tan bodies. Their bodies are overlaid with hourglass-shaped dark brown markings. Their triangular head is proportionately large. The color of their head is dark coppery brown. This is the reason they have the name “Copperhead.”

Where Do Eastern Copperheads Live in Maryland?

Eastern Copperheads live throughout Maryland. However, they are absent from a few counties along the eastern shore. They are found in rock piles, rocky woodlands, and river bottoms. The leaf and plant debris in these areas provide cover for them to hide.

Eastern Copperhead Behavior

Copperheads are dangerous because they use camouflage as their number one defense mechanism. In other words, these snakes choose to lie perfectly still rather than flee most of the time. Their camouflage helps them blend in with leaf litter and other ground debris.

When they feel threatened, they occasionally mimic the tail vibration of a rattlesnake. But, in most cases, they choose to lie perfectly still.

Most copperhead bites on humans occur when the person steps on or near the snake.

Wintertime Brumation

Snakes do not tolerate the cold weather in the winter months very well. They are ectotherms, which means they can not regulate their body temperature internally. Physiologically, ectotherms cannot hibernate. Yet, they go into a state of suspended animation called brumation for up to 6 months out of the year.

Copperheads winter underneath rocks, in hollow logs, and in fissures on rocky hillsides. An individual might brumate alone in some parts of their range. But copperheads tend to be social. In some areas, they congregate together in dens with other snakes through the winter.

In hilly terrain, south-facing slopes capture more radiant warmth from the sun. So, that is where these dens are generally located. The other snakes they den with are not necessarily just copperheads. Sometimes, they share their dens with other species of snakes. You may find a Timber Rattler, a Black Rat Snake, or an Eastern Black Racer sharing the same den with copperheads. These wintertime dens may hold up to 60 snakes.

What Do Copperheads Eat?

Copperhead snakes are opportunistic feeders. They eat large insects, spiders, small rodents, small animals, birds, and other reptiles.

How Dangerous Are Copperheads?

A Copperhead can bite and inject venom from the time they are newly born. Like most pit vipers, they have hemotoxic venom. 

Most copperhead bites are not life-threatening. On the other hand, any bite from this snake is a medical emergency and should be treated as such. Prompt medical attention increases the chance of a good outcome.

Copperhead bites can cause intense pain, shock, and swelling. Their bites also have the potential to cause blood in urine, tissue damage, and kidney failure.

An interesting study has found that Copperhead venom contains a protein called contortrostatin. Contortrostatin has been found to stop the growth of cancer cells in mice.

Timber Rattlesnake

Scientific Name:	Crotalus horridus
Description:	Adult Timber Rattlesnakes grow between 36 and 60 inches (.91 to 1.52m) long. Their bodies are yellowish-brown with a dark chevron pattern. They also have a rusty stripe down their backs. Their tails are dark brown or black.
Habitat:	Timber Rattlesnakes prefer wooded areas and hillsides with rocky outcroppings.
Conservation Status:	Endangered Species

Timber Rattler and Canebrake Rattlesnake are both common names for the Timber Rattlesnake. Generally, in higher-elevation habitats, they are called Timber Rattlesnakes. On the coastal plain, though, they’re called Canebrake Rattlesnakes.

The average Timber Rattlesnake grows between 36 to 60 inches (.91 to 1.52m) long. However, there have been reports of them growing up to 7 feet (2.13m) long. See

These snakes vary in color. Their general base coloration is a yellowish-brown to grey-brown, though. They have a dark brown to black chevron pattern on their back and sides against a lighter base color. Moreover, they have a rusty to reddish stripe down their backs. Their tails are dark brown or black with a tan rattle. There are also melanistic timber rattlers. These are dark and sometimes almost entirely black. In the dark color morph of these snakes, the tail is also darker than the rest of the snake’s body.

Where Do Timber Rattlesnakes Live in Maryland?

The Maryland Department of Natural Resources states that the Timber Rattlesnake is endangered. These snakes are found from the Susquehanna River to the western portion of Maryland.

The Timber rattlesnake lives in various habitats. These include mountainous forests, pine forests, and farm fields. They can also be found in swampy areas and river floodplains. In the winter, they are found hibernating in crevices in the ground. These snakes are marvelous climbers and have been found in trees at heights of more than 80 feet.  Source

What Do Timber Rattlesnakes Eat?

Timber rattlers prey on small mammals such as mice, rats, squirrels, and chipmunks. They also eat small birds, other reptiles, and amphibians.

These snakes are excellent climbers. In fact, timber rattlers have been found in trees at heights of more than 80 feet. Source

In 2013, University of Maryland researchers conducted a study. This study has proven that timber rattlesnakes help control Lyme disease. This is because as they consume rodents, they’re also consuming ticks. A timber rattler will consume 2,500 to 4,500 ticks per year, depending on the location. See

Wintertime Brumation

As we discussed in the section on copperheads, snakes brumate in the winter. Brumation is a reptile’s version of hibernation.

Timber Rattlesnakes make wintertime dens in sheltered spots. They den underneath rocks and logs, as well as in fissures in rocky hillsides. An individual Timber Rattler might brumate alone in some parts of their range. But in other areas, they congregate in dens with other snakes through the winter.

Dens are usually placed on slopes facing south because they get more warmth from the sun. They don’t always share their dens only with Timber Rattlers. Sometimes, they share their dens with other species of snakes. These might include Copperheads, Black Rat Snakes, and Eastern Black Racers. These wintertime dens may hold up to 60 snakes. Source

How Dangerous Are Timber Rattlesnakes?

Timber Rattlesnakes are among the most dangerous snakes in North America. This is due to their long fangs and high venom yield. 1% to 10% of untreated Timber Rattlesnake bites result in a fatality.

Fortunately, 40% to 60% of the time, they produce dry bites. In other words, although their fangs penetrate the body, they do not inject any venom. Source

These snakes produce hemotoxic venom. Timber Rattlesnake bites sometimes cause serious complications. These include shock, seizures, coma, internal bleeding, blood clots, and deep tissue damage. Source

Symptoms of Venomous Snake Bites

Maryland Poison Control typically registers 100 snake bite cases annually. Roughly half attributed to bites from venomous snakes, particularly those inflicted by copperheads.

Some of the symptoms you may experience when a venomous snake bites you include:

• Discoloration in the area of the bite.
• Swelling in the area of the bite.
• Loss of muscle coordination.
• Tingling sensation in the area of the bite.
• Feeling nauseous.
• Having a faster heartbeat or rapid pulse.

What Should You Do if You Are Bitten?

If you or someone you are with has suffered a venomous snakebite, time is of the essence. Because the sooner a victim receives antivenom, the less chance the venom in their body has to cause harm. In other words, it is important to seek immediate medical attention.

Do not attempt to kill the snake for identification purposes. This gives the snake a chance to bite you again. Also, consider that severed snakeheads can still bite and envenomate and often do. If you have a phone, take a picture of the offending reptile. Otherwise, get started on your way to the nearest hospital.

First Aid for Snake Bite Victims

• Remain calm and limit your movements. Do not run. If you must hike back to a vehicle, do it calmly and deliberately. Put as little stress on your heart as possible.
• Keep the area of the snake bite below the heart level and never above the heart level. Keeping the bite below the heart level will reduce the venom’s flow. However, holding the bite above your heart level will increase the venom’s flow.

• Remove all constricting items such as bracelets, watches, or rings before swelling occurs.
• Remember that using a cold compress on a venomous snake bite is not advisable. The cold may cause the local blood vessels to constrict and spread the venom faster.
• You can wash the affected area like any other wound with soap and water.
• You may cover the bite area with a moist dressing to reduce the swelling.

• Get medical attention as soon as possible. Call the hospital to tell them a venomous snake has bitten you. So they can have antivenom ready to give you when you arrive.
• A person whom a venomous snake has bitten may go into shock. If this happens, lay them flat and cover them with a blanket.

Dressing for Snake Country

• High-top leather boots and long pants are both wise ideas.
• Also, wear loose-fitting denim. If there’s a gap before the snake’s fangs touch your skin, your chances of being envenomated are lower.
• In the absence of high-top leather boots, some people wear snake gaiters.

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