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The eastern racer, or North American racer (Coluber constrictor), is a species of nonvenomous snake in the family Colubridae. The species is endemic to North America and Central America. Eleven subspecies, including the nominotypical subspecies, are recognized, which as a group are commonly referred to as the eastern racers. The species is monotypic in the genus Coluber.


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Adult eastern racers can typically vary from 50 to 152 cm (20 to 60 in) in total length (including tail) depending on the subspecies, but a record-sized specimen measured 185.4 cm (73.0 in) in total length.[4][5][6] A typical adult specimen will weigh around 556 g (1.226 lb), with little size difference between the sexes.[7] The patterns vary widely among subspecies. Most are solid-colored as their common names imply: black racers, brown racers, tan racers, blue racers, or green racers. "Runner" is sometimes used instead of "racer" in their common names. All subspecies have a lighter-colored underbelly: white, light tan, or yellow in color. Juveniles are more strikingly patterned, with a middorsal row of dark blotches on a light ground color. The tail is unpatterned. As they grow older, the dorsum darkens and the juvenile pattern gradually disappears.[4]

The eastern racers are fast-moving, highly active, diurnal snakes. Their diet consists primarily of small rodents, other mammals (as large as small cottontail rabbits), frogs, toads, small turtles, lizards, and other snakes.[8][9] Some subspecies are known to climb trees to eat eggs and young birds. Juveniles often consume soft-bodied insects and other small invertebrates,[10] as well as small frogs, small reptiles (including lizards and snakes and their eggs), young rodents, and shrews.[9] Despite their specific name, constrictor, they do not really employ constriction, instead simply subduing struggling prey by pinning it bodily, pressing one or two coils against it to hold it in place instead of actually suffocating it. Most smaller prey items are simply swallowed alive.

They are curious snakes with excellent vision and are sometimes seen raising their heads above the height of the grass where they are crawling to view what is around them. Aptly named, racers are very fast and typically flee from a potential predator. However, once cornered, they put up a vigorous fight, biting hard and often. They are difficult to handle and will writhe, defecate, and release a foul-smelling musk from their cloacae. Vibrating their tails among dry leaves, racers can sound convincingly like rattlesnakes.[11]

Most of the eastern racers prefer open, grassland-type habitats where their keen eyesight and speed can be readily used, but they are also found in light forest and even semiarid regions. They are usually not far from an area of cover for hiding.

Seeing a five-foot long northern black racer (Coluber constrictor) hunting in a meadow or climbing a shrub can be a memorable wildlife encounter where responses range from wonder to heart-stopping fear. Sadly, encounters with black racers are declining in New England. As with many other species, black racers are at risk from habitat loss and fragmentation, and anecdotal information indicates the species is declining in our region. The Massachusetts State Wildlife Action Plan ranks the black racer as common across the state, but it is of concern because little is known about their current abundance and distribution.

The complete story of the study, along with more black racer facts, can be found in the No. 2, 2021 issue of Massachusetts Wildlife magazine. Other topics include hooded mergansers, an endangered species art exhibit, and advice on becoming a hunter on a budget. To subscribe, visit mass.gov/dfw/magazine.

If you see a northern black racer, MassWildlife encourages you to report your sighting using Heritage Hub, mass.gov/heritagehub. Obtaining population data from citizen scientists like you is a critical component of conservation.

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Description: Racers are large, relatively slender snakes known for their speed. They have rather large eyes, smooth scales, and in North Carolina are solid black as adults, although some have a whitish chin. As juveniles, racers are gray or brown with dark reddish-brown spots running along their backs. Juveniles are typically gray with darker brown spots. Racers can be distinguished from black rat snakes because of their uniform color, slender bodies, and smooth scales.

Miscellaneous: Although they are often confused with the black rat snake, the black racer can be easily distinguished by their smooth scales. Although racers will often aggressively defend themselves and will usually bite repeatedly if picked up, they do not chase people as is often claimed. When pursued, they often climb into bushes or trees to escape their would-be captor. Though they are fast for a snake, a person can easily outrun one on open ground.

Non-Venomous. North American racers are not dangerous to people or pets, but they will readily bite to defend themselves. Racers are not aggressive and avoid direct contact with people and pets. Virtually all bites occur when the snakes are intentionally molested.

When approached, racers will typically flee for shelter, relying on speed and agility to avoid capture. However, if they are cornered, both juveniles and adults will strike at the attacker and rapidly vibrate the tip of the tail, which produces a buzzing sound in leaf litter. If grabbed or pinned, they will readily bite the attacker. Nonetheless, these snakes are not aggressive, and striking is only used in defense as a last resort.

North American Racers are opportunistic and diurnal predators with a diet as varied as their choice of habitat. They are known to feed on small mammals, birds and their eggs, lizards, turtles, snakes, frogs, salamanders, fishes, insects and spiders. In Florida, frogs, lizards, and small snakes make up the majority of their diet. Despite their scientific name (Coluber constrictor), racers are not true constrictors and overpower their prey by simply grabbing it in their jaws and pressing it against the ground until it stops struggling or by quickly swallowing it alive.

Juvenile North American Racers are often mistaken for pygmy rattlesnakes. Juvenile racers are long and pencil thin, whereas pygmy rattlesnakes are much thicker for their length. As always, if you are not 100% positive of the identification of a snake, it is best for everyone involved to leave it alone.

Burbrink, F.T, F. Fontanella, R.A. Pyron, T.J. Guiher, and C. Jimenez. 2008. Phylogeography across a continent: the evolutionary and demographic history of the North American racer (Serpentes: Colubridae: Coluber constrictor). Molecular Phylogenetics and Evolution 47(1): 274-288. DOI: 10.1016/j.ympev.2007.10.020

The rubber boa is sometimes confused with the racer because both species have similar coloration. Racers differ in having large eyes, large dorsal scales and a tail that tapers to the tip. Racers are fast, aggressive snakes whereas rubber boas are slow, non-aggressive snakes.

This map from the Washington Herp Atlas illustrates the distribution of western racer in Washington based on records in the WDFW database as of 2016. If you see this species in areas that are not indicated on the map or have more recent observations (less than 10 years), please share your observation using the WDFW wildlife reporting form.

Here's a photo of the foundation of our racer: A Makita 9403, which I snagged on Amazon for a great price. My research uncovered that this sander is the fastest stock sander, with 1650fpm (feet per minute). That fact alone makes this a great choice if you are racing in the Stock Class. Seeing that the track is 75' long, and for simplicity let's just figure that it reaches full speed instantaneously, (I wish) that means that this sander theoretically could cover that distance in 2.2 seconds. Now, obviously it will have to build-up to full speed, and there will be some time loss due to slippage between the belt and the track and even between the belt and the drive roller, but this is still a good start.


There are some major modifications ahead, but first let's lighten this sucker of any unnecessary parts...

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