Snake are an important part of healthy ecosystems. A 2013 study by University of Maryland researchers found that a single timber rattlesnake removed up to 4,500 ticks from the forest annually by consuming tick-carrying small mammals. This removal ultimately can decrease the spread of Lyme disease. Every day, snakes function as vital predators, as well as prey. Because of their importance, all snake species are protected in Maryland under the Nongame and Endangered Species Conservation Act.
Maryland is home to 27 species and sub-species of snakes, including two with medically significant venom, the copperhead and the timber rattlesnake.
Eastern Copperhead by Linh Phu (left); Timber Rattlesnake by Scott Smith (right)
Snake venom is saliva with zootoxins designed to immobilize and digest prey, as well as for defense. Venom is injected by fangs and is stored in a duct. Venomous snakes can deliver dry bites (without venom) as a warning. The toxins in venom vary by species; therefore, different venom can produce different functions.
Interestingly enough, snake venom also has medical benefits. For example, copperhead venom has been found to be effective at attacking breast cancer cells, but not healthy cells. Other medical uses for venom include dissolving blood clots, fighting bronchial asthma, treating Parkinson’s disease, and treating Alzheimer’s disease.
Several of Maryland’s snakes possess venom, but only the copperhead and the timber rattlesnake have medically significant venom known to cause adverse reactions in humans. These two species are pit vipers (Subfamily Crotalinae). Pit vipers are named for the heat seeking pit between each eye and nostril. Both of Maryland’s pit vipers should be treated with caution and should not be approached or handled. The graphic on the right, and the associated table below, show characteristics of pit vipers in Maryland versus other Maryland snakes.
* Some snake species, like eastern ratsnakes and northern watersnakes will flatten their heads when threatened to mimic pit vipers.
** These characteristics are helpful when examining shed snake skins.
On average, Maryland Poison Control receives 100 snake bite cases each year, about half of which are due to bites from venomous snakes, mostly copperhead bites. Snake bites are serious and require expert evaluation and treatment. Below are some tips on how to avoid being bitten:
If bitten by a venomous snake, immediately contact the Maryland Poison Center at 800-222-1222. The Maryland Poison Center is open 24 hours a day and is staffed by pharmacists or nurses who are specially trained and certified in emergency poisoning and overdose cases. Do not apply ice, a tourniquet, or make an incision around the wound as these methods do not work and may cause complications.
Snakes are a part of our natural world. If there is cover and food for snakes around your home, they will likely be present. Snakes will shy away from humans if given the chance, but they respond more to ground vibrations than sound. Their response to ground vibrations is often defensive when encountered. To deal with snakes, you can either learn to live with them or make your surroundings less enticing for snakes. To discourage snakes from your yard:
Dense foundation plantings can provide cover for snakes by Victoria Fee, licensed under
It’s important to note that even with taking the precautions above, there is no way to completely exclude snakes from outdoor areas. Snakes serve vital roles as predators, and only a small percentage of snakes in Maryland are venomous. It is important to familiarize yourself and your family about wildlife safety and identification.
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