HerpMapper

HerpMapper (HM) is a relatively new global herp atlas and data hub project that receives “catch and release” data from the general public, herpers, other citizen scientists, and professionals. HM data are only viewable to county-level to the public, but HerpMapper does make these data freely available to HM Partners – groups that use these recorded observations for research, conservation, and preservation purposes. More more information see our F.A.Q. page.

HerpMapper Wants You!

  • Data contributors
    • Citizen scientists
    • Herpers
    • Professionals
  • Data Partners (view our current list of Partners).
    • National, regional, and local units of government
    • Non-governmental conservation groups
    • Existing herp atlas projects
    • Researchers
    • Other conservation partners
  • Promoters – share our flyer (English, Spanish, Chinese).
    • Website administrators
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    • Herpers and other naturalists

Share with Confidence!

  • Public does not have access to detailed location information (example)
    • County-level only in United States
    • Similar scale for other countries that do not use counties
  • Can choose to completely restrict public access to specific observations
  • Maintain access to data you have submitted
  • Export your data in a wide variety of formats (more upon specific request)

Data is Available!

  • Free access for research, conservation, and preservation purposes
    • Supports one-time requests and continuous access
  • Shared data available at multiple scales
    • City to international-level access
    • Species-specific access
  • Photo or audio vouchers for all observations
  • All observations have a HM accession number (example: HM 39316)

Easy to Use!

  • Easy web interface that extracts voucher metadata when present
  • FREE Mobile Mapper app (Android and Apple) that allows multiple configurations
  • App does NOT need cell signal to work in the field!
  • Options to bulk import existing data sets! See importing data

For more information about contributing or receiving data, or for questions and concerns, contact: info@herpmapper.org

Don’t forget to “Like” us on Facebook, follow us @HerpMapper on Twitter, or comment on Field Herp Forum!

Rough Earth Snake, Virginia striatula

The Rough Earth Snake

Virginia striatula


Non-Venomous

The rough earth snake (Virginia striatula) is a very small, fossorial snake that is common throughout most of its range.  This snake averages 7-10” in length and there is only a few documented cases of this snake reaching over a foot in length.  These little guys are brown, gray, or reddish in color.  The rough earth snake has no pattern except for a few specimen having a light band around the neck.  The band is usually more visible in young.  The belly of the snake is usually white, tan or cream.  The band around the neck of young and a few of the adult specimen do sometimes cause mis-identification with Ringneck’s.

Rough Earth Snake found on a warm December 2nd, 2014 By: Phillip Laxton
Rough Earth Snake found on a warm December 2nd, 2014
By: Phillip Laxton

The rough earth snake derives its name from the keeled scales found on this species.  The presence of these keels help differentiate the rough earth snake from the very similar smooth earth snake (Virginia valeriae).  The rough earth snake is also commonly confused with the worm snake (Carphophis amoenus), and the DeKay’s Brown snake (Storeria dekayi).  Smooth earth snakes look very similar to the rough earth snakes except for the lack of keels.  The DeKay’s brown snake has checker and striped markings on its back.

The rough earth snake and the smooth earth snake were thought at one time to be extremely closely related.  This was due to the fact they looked so much alike.  With the use of mDNA, the two species have been found to be a bit further separated than previously thought.

Feeding/Diet:
Rough Earth Snake found on a warm December 2nd, 2014 By: Phillip Laxton
Rough Earth Snake found on a warm December 2nd, 2014
By: Phillip Laxton

The primary food source for the rough earth snake is earthworms and soft-bodied insects.  It is believed that most populations feed almost exclusively on earthworms.  In my herping experience, I have regularly found them under cover in places with lots of earthworms.

General Behavior:

The behavior of the rough earth snake is very typical of most fossorial snakes.  The rough earth snake is rarely ever seen out in the open.  The snake’s secretive nature results in the general public rarely encountering them.  The rough earth snake is regularly found under cover.  Flipping is generally the best way to find this snake.  There is some indication the snake may be slightly social, with multiple specimens being found in very close proximity.  It has yet to be determined if snake concentrations are social or prime habitat driven.

When encountered, the rough earth snake will typically freeze in place or make a mad dash towards the nearest hole.  When picked up, the rough earth snake will usually squirm around violently and release a musk along with defecation.  The snake regularly digs its head into the skin of the handler.  This is thought to aid in movement and not necessarily an act of aggression.  The rough earth snake is not known to bite.

Rough Earth Snake  By: Phillip Laxton
Rough Earth Snake
By: Phillip Laxton

There was an interesting article produced by the Transactions of the Kansas Academy of Science, discussing the frequency of small fossorial snakes using ant nest as a hibernacula.  The study focused on smooth earth snakes, DeKay’s snakes, young garter snakes, and ringneck snakes.  The article did lightly reference the rough earth snake.  The article presented the case that the snakes were using ant nest under tin as a hibernacula.  The study mentioned the likelihood of the rough earth snake also using the nest.  The fact that rough earth snakes are not as common in the study area resulted in there not being enough data.  The paper can be found for free at; “Use of an Active Ant Nest as a Hibernaculum by Small Snake Species” by, George R. Pisani.

Although I have not studied the topic in detail, it is my experience, that I would support the theory.  I regularly find rough earth snakes in ant nest early spring and late fall.  I have on occasion, found rough earth snakes on the occasional warm winter day, under some tin in an ant nest.

Habitat:
Rough Earth Snake By: Shawn Hayes
Rough Earth Snake
By: tx_snakewrangler

Within the rough earth snake range, this snake can regularly be found in loose damp soil.  A good rule of thumb would be, look for earthworms.  If the soil is loose enough and moist enough for earthworms, you will find rough earth snakes.  They can regularly be found flipping boards, logs, tin, or other ground cover.  The rough earth snake regularly visits flower beds.  The rough earth snake has a very small home range.  Many snakes can be found repeatedly each season, from year to year.

Reproduction:

The rough earth snake breeds in early spring.  They are one of the first active snakes when spring arrives.  The mother will give birth to 3-11 young, each totaling approximately 4” in length.  The young will look just like the adults accept many will have a light ring around the neck and the head tends to be much darker.

Neat Fact:

The small fossorial snake populations are generally considered a staple species when I begin herping a new location.  Many other snakes feed on small species like the Rough Earth Snake.  King snakes, Mole snakes, Pigmy Rattle Snakes, young Rat and Corn snakes, and other Herps depend on these small fossorial snakes as a primary food source.  In my experience, where there are little snakes there are big snakes.

As another neat fact, I use the emergence of the rough earth snake and the anoles as a sign.  When these guys emerge, it is time to get the herping gear out.  As a very cold tolerant species, that is small in size, that is typically under sunny cover, they are some of the first to get moving around!

Herping Tips:
  • Look under light weight cover any time of year.
    • In spring and fall look under cover in direct sun light.
    • In summer, look under cover that is in the shade.
    • In winter, on warm days, you can still find these guys under sunny cover.
  • Specimen are easy to find under cover when ground is saturated. (after heavy rain)
  • Look in areas with earthworms (favorite food source).
  • They tend to buddy up with ringnecks and DeKay’s.

 

Eastern Hog-nosed Snake (Heterodon platirhinos)

 

Eastern Hog-nosed Snake

(Heterodon platirhinos)

non-venomous*

 

At a glance: The Eastern Hog-nosed Snake is a non-venomous, harmless toad-eater, often confused with copperheads and rattlesnakes due to an impressive BLUFF display (including headbutts and hissing), that ultimately plays “possum” when harassed.

*This snake has enlarged teeth in the back of it’s mouth, used exclusively for feeding. These teeth help deliver secretions that are toxic to amphibians, but not mammals. However, it is possible to be allergic to the secretions, so it is best not to stick your finger into the the mouth of this harmless snake.


 

Quick Facts:

Scroll down for an in depth look at each section

 

Common Names: Hognose, Adder (Sand Adder, Blow Adder, Spitting Adder), Viper (Sand Viper, Blow Viper)

Identification: Upturned snout, heavyset body. Variable color.  Loud hisser. Plays “possum”.

Size: Adults are typically 2 feet in length, but the largest can reach nearly 4 feet.

Range: United States: New Hampshire south to Florida, west to Texas, North to Minnesota. Canada: Ontario.

Eastern Hognose Occurrence by State
Eastern Hognose Occurrence by State. Map created by the author, John Vanek.

Activity: Diurnal (daylight), Crepuscular (dawn and dusk)

Diet: Amphibian specialist. Eats mostly frogs and salamanders, with a particular fondness for toads.

Habitat: Most commonly encountered in areas of sandy soil and open canopy, but can be found in mountains, rocky hillsides, and stream corridors.

Herping Tips: Focus searches in open sandy areas during the spring and fall breeding seasons. Avoid the hottest portions of the day, and don’t focus on movement: these snakes often stay put when first spotted. Road-cruising paved roads is generally unproductive for this species.

Conservation Concerns: While still common in some areas, this species is protected in many parts of its range due to habitat destruction and wanton killing.



In Depth Information:

  Identification:

Pattern and Color: The Eastern Hog-nosed Snake (hognose) is a highly variable species, and can range from complete black (melanism) to to bright yellow. In general, this snake has a light background with dark saddles. There is typically a dark band between the eyes, and the belly (ventral surface) is usually a light color. Freshly hatched snakes are typically grey with dark saddles, including snakes that will eventually be completely black. A sample of the massive variation in this snake is show below.

User submitted photos from the Facebook photo contest: Grey, Dave Fitzpatrick; Brown, Jamie Zachary; Yellow, Matt Sullivan; Red, Zack Tyler, Black, Zack Tyler, Dark with orange, Chris Kirby.

Head: The head is stout, with an upturned rostral (nose) scale. The eyes are set on the side of the head, and are large, with round pupils. The lips (labial scales) are often pale in color, even in black individuals. This snake will often flatten it’s head, giving it a triangular appearance. The top of the head typically has a unique set of markings that can be used to identify individuals (see below).

Original Photo by Kyle Loucks from Facebook Photo Contest
Original Photo by Kyle Loucks from Facebook Photo Contest

Body: This snake is heavy set, and is usually about twice the weight of a garter snake (Thamnophis sp.) of the same length. Like the head, the body can be compressed, and appear even wider. The “neck” has a hood, and can be spread like a cobra due to flexible ribs.

Example of a hognose spreading its "hood." Photo by @dgreen962 from the Instagram Photo Contest.
Example of a hognose spreading its “hood. Photo by @dgreen962 from the Instagram Photo Contest.

Behavior: The Eastern Hog-nosed Snake is most famous for its incredible behaviors. When first encountered by a predator, this snake will hiss loudly, spread its hood, and curl it’s tail. It will often make a series of false strikes (essentially “headbutts”) with a closed mouth. If this fails, the snake will either crawl away, or play dead like an opossum. This elaborate death-feigning routine often starts with the regurgitation of a prey item. Then, the snake will writhe in circles, mouth open, tongue out, release the contents of its musk gland, and defecate. Finally, the snake flips over on it’s back, and will remain belly up. The snake will remain this way until the threat is gone. However, if the snake is picked up and placed back on it’s belly, it will flip back over onto it’s back, giving it away!

Example of H. platirhinos playing dead and regurgitating a toad. Photo by @willie_in_the_woods from the Instagram Photo Contest.
Example of H. platirhinos playing dead and regurgitating a toad. Photo by @willie_in_the_woods from the Instagram Photo Contest.

Size: Baby hognose snakes hatch out of the egg as little as 3 – 7 grams and roughly 5 inches in length, but grow quickly. Most adults snakes are about 2 feet long, but the largest individuals max out at ~4 feet.

Baby H. platirhinos. Photo by @itrains4days from the Instagram Photo Contest.
Baby H. platirhinos. Photo by @itrains4days from the Instagram Photo Contest.

Sexing: Males and females look very similar, and reach similar sizes (although females are typically larger than males). However, when comparing females and males of the same size, the male’s tail is much longer and thicker. Males typically have >45 pairs of caudal (tail) scales, whereas females typically have <45.

Male and female H. platirhinos
Male and female H. platirhinos.

 

Despite the female being much larger, the male has a longer tail.
Despite the female being much larger, the male has a longer tail.

 

Range: A snake of the eastern United States and Canada. In the United States, it occurs in southern New Hampshire south to Florida, including barrier islands along the coast, east to western Texas, and north to Minnesota. In Canada this species is only found in Ontario. Despite the broad range, a finer look at each state shows fragmented and sporadic occupancy. For example, in New York, the snake can only be found in small, disjunct populations on Long Island, the Saratoga Sand Plains/ Albany Pine Bush, and the lower Hudson Valley.

ny map
Distribution of H. platirhinos in New York, based on data from the NYS Herp Atlas.

Activity: 

Daily: The Eastern Hog-nosed Snake is primarily diurnal (active during the day), although it can also be found during dusk and dawn, particularly during the heat of the summer or in more southern portions of its range. This snake is rarely found to be active at night.

Seasonal: Hognose snakes usually have large home ranges (over 75 acres!), and individuals (males in particular) tend to move the most during the spring (emergence from hibernation) and fall (journey back to hibernation locations).


Diet: This species is an amphibian specialist. It mainly feeds on frogs, toads, spadefoots, and salamanders. In most areas, it feeds most heavily on toads (genus Bufo Anaxyrus ). The hognose snake is immune to the poison of toads and other frogs, possibly due to an enlarged adrenal gland. It is often thought that the hognose uses it’s enlarged rear fangs to “pop” inflated toads, but this is a myth. The teeth are used as anchors to prevent prey from escaping, as well as to help deliver its toxic (to amphibians) saliva. It will also eat newts and efts (genus Notophthalmus) and is likely immune to their poison as well.

A neonate H. platirhinos eating a young-of-the-year Fowler's Toad.
A neonate H. platirhinos eating a young-of-the-year Fowler’s Toad.

 


 

Habitat: The hognose snake is typically associated with sandy soil, but is actually a habitat generalist, and can be found in mountains, forests, plains, swamps, river valleys, and beaches. It does, however, appear to be most common (or commonly seen) in open, disturbed areas with sandy soil. This is likely because the snake digs a nest in sunny openings to lay its eggs, which require warm temperatures to hatch. Despite it’s preference for amphibians, standing water is not a requirement for this species, and it can survive in areas with only temporary sources of water (toads often only require short-lived pools or puddles to reproduce). It can occur in very dense populations on barrier islands in the Atlantic Ocean.

atlantic
Heterodon platirhinos from a NY barrier island. Photo by the author, John Vanek.

Herping Tips: Look for Eastern Hog-nosed Snakes during the spring and early fall. This snake can be found year round (in the southern portion of its range), but not as often during the summer or winter. It can tolerate hot temperatures, but is most active during the morning and late afternoon, avoiding the heat of the midday sun. In the northern part of its range, this snake hibernates during the winter, but may emerge to bask on warm days. It is not commonly found under cover objects, and most commonly encountered on sand roads or open sandy areas. This snake is only very rarely found on paved roads, and therefore road-cruising paved roads is ineffective.


 

John with tortoise

About the Author: John Vanek is a Master’s candidate at Hofstra University,where he studies the ecology of Eastern Hog-nosed Snakes. He received a BS in Wildlife Science from the SUNY-College of Environmental Science and Forestry in 2010. John has been fortunate enough to study a wide range of wildlife, including Eastern Hellbenders, Timber Rattlesnakes, Black Bears, and Peregrine Falcons. He has worked as a wildlife technician and environmental consultant for several companies, universities, and organizations. John can be reached on Twitter @Nomadofthehills and Instagram @johnpvanek, and is also a moderator for the 2,500 member facebook group Snake Identification.

Be sure to check out John’s article Timber Rattlesnake