Southern black racer

The southern black racer (Coluber constrictor priapus) is one of the more common subspecies of the non-venomous Coluber constrictor snake species of the Southeastern United States. The subspecific name priapus refers to the proximal spines of the hemipenes being much enlarged into basal hooks, which is characteristic of this subspecies.[1] These snakes are quite active during the day, which increases the chance of sightings. They eat almost any animal they can overpower, including rodents, frogs, toads, and lizards. Members of this species generally do not tolerate handling – even after months in captivity – and typically strike and flail wildly every time they are handled, often defecating a foul-smelling musk, a common defense against predators in snakes. Adults of the species are usually thin with a jet black dorsal side with a grey belly and white chin. They are quite fast, giving rise to the name "racer".

Southern black racer
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Colubridae
Genus: Coluber
Species:
C. constrictor
Subspecies:
C. c. priapus
Trinomial name
Coluber constrictor priapus
Dunn & Wood, 1939

Description

Typical size for this snake is 51–142 cm (20–56 in), and the record is 180 cm (72 in). The southern black racer has a white chin, whereas an indigo snake normally has a dark to reddish-orange chin.[2] Juveniles can have red or brown blotches but this generally fades as the snake ages.[3]

Diet

The southern black racer is a predator that relies on lizards, insects, moles, birds, eggs, small snakes, rodents, and frogs. Despite its specific name constrictor (scientific name: Coluber constrictor), the racer is more likely to suffocate or crush its victim into the ground, rather than coiling around it in typical constrictor fashion.[2]

Man remains the greatest enemy of black racers. Many are killed on highways and others are intentionally killed out of fear. The southern black racer can be mistaken for a cottonmouth – a venomous snake more commonly called a water moccasin. The venomous snake has a white lining inside of its mouth. Racers are nonvenomous and do not breed with cottonmouths. Natural enemies include such birds of prey as hawks, including the red-shouldered hawk and broad-winged hawk. These perching and soaring birds have keen eyesight and drop down from above to capture black racers and other snakes in a manner that makes the snake's speed and ground awareness ineffectual.[4]

  • Black racers wait for prey in dry leaves and brush.
  • Black racers are excellent climbers.
  • Black racers are not strangers to suburban yards.
  • Black racer with head elevated
  • Black racer
  • Like most cold-blooded creatures, the black racer relies on sun and shade to regulate its temperature.
  • Note the white marking around the mouth
  • A black racer examines a green hose.
  • A 24-in shed racer skin
  • Stalking a dragonfly
  • Resting and waiting for food from a tree
  • Southern black racer at St. Sebastian River Preserve State Park in Indian River County, Florida

References
  1. Schmidt,K.P. and D.D. Davis. 1941. Field Book of Snakes of the United States and Canada. This snake is a black snake. G.P. Putnam's Sons. New York. 365 pp. (Coluber constrictor priapus, p. 125.)
  2. Palmer, E. Laurence, ed. (1974). Fieldbook of Natural History (2 ed.). McGraw Hill. ISBN 0-07-048425-2.
  3. "Southern Black Racer". Reptile Range. Retrieved 10 June 2020.
  4. John Farrand; John Bull; Roger Tory Peterson, eds. (December 1979). National Audubon Society Field Guide to North American Reptiles and Amphibians. Alfred A. Knopf. ISBN 0-394-50824-6.
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