Common
Name:
Timber Rattlesnake, Canebrake Rattlesnake, Banded
Rattlesnake – The name ‘timber’ describes the snake’s preferred habitat of
rocky hills and timbered uplands. The species is one of several that employ the
auditory and aposematic warning of the rattle.
Scientific
Name:
Crotalus horridus
- A crotalum is one of a pair of small
cymbals that were used in antiquity to make a clicking noise; the castanet is a
vestige. The generic name derived from it refers to the clicking noise made by
the segments of the rattle. The species name horridus, in spite of its seeming etymological association with
‘horrid,’ has nothing to do with either the human perception of the snake or
its venom. Horridus is Latin for
‘rough’ or ‘bristly,’ and refers to the roughness of the scales – in marked contrast
to the smooth skin of many snakes.
As the only large and relatively common poisonous
snake in the Appalachian Mountains, the timber rattlesnake evokes both
existential fear and biding respect to any who cross its path. There is
certainly a justification for these perceptions from the physical perspective:
its size ranges from 3 to 5 feet (the record is 6 feet); its venom is exuded in
copious quantities through long and penetrating fangs; its potentially lethal
strike is launched at lightning speed that is almost too fast for the eye and
certainly too fast for the reflexes; and its venom can be deadly to humans if
untreated. However, the incidence of timber rattlesnake strikes on humans is
vanishingly small; the only known fatality in the last ten years during the use
of snakes in a religious ceremony in West Virginia. The reason for the
disparity between the potential for injury and the incidence of injury is that
the timber rattlesnake is docile, and will only strike if repeatedly provoked
and threatened.
The timber rattlesnake is a
consummate predator, well endowed with both the sensory tools and the physical
agility to sustain its wholly carnivorous nutritional needs. As a pit viper, it
has the namesake opening, or pit, just below the feliform vertical eye slit;
the pit is the primary means of detecting prey.
The sensory organ in the pit is a heat receptor, capable of detecting a
1°C difference at a range of about one foot. This is both necessary and
sufficient to detect and engage its warm-blooded prey during the preferred nocturnal
forays when the cooler air accentuates the temperature differential. The strike
is executed by the reflex-quick straightening of the lateral muscles to transition
from either an S-shaped or coiled stance to full length extension; the fanged
triangular head is projected about half of its body length. In other words, a 4
foot snake can strike at 2 feet. Contrary to popular folklore, the coiled
position is not a strike prerequisite, though the snake will typically assume
this posture in anticipation of a mammal’s traverse. Following the consummation
of a successful strike, the olfactory sensors on the forked tongue are used to
locate the head from the emanations of the victim’s mouth odors to initiate
cephalic ingestion, a preference based on the anatomical connections of any
attached appendages. Digestion is almost total; the gastric fluids in the
rattlesnake dissolve everything including the bones, adding about 40 percent of
the snake’s body weight annually. The prey consist almost entirely of small
mammals. According to Linzey and Clifford in Snakes of Virginia, a 1939
survey in George Washington National Forrest which included the capture and
evisceration of 141 timber rattlesnakes, the stomach contents consisted of 38%
mice, 25% squirrels and chipmunks, 18% rabbits, 13% birds, and 5% shrews; one
had eaten a bat.
The signature rattle is a curiosity in its
constitution and a conundrum from the standpoint of how it may have evolved;
rattlesnakes are found only in the Western Hemisphere. The rattle starts as a
bell-shaped horny protuberance called a button at the end of the tail. Every
time that the snake molts, which ranges from one to five times a year according
to age and growth rate, the caudal end remains attached to form a segment of
the rattle; the rattle grows in length by one segment for each molt. While it
would theoretically be possible to count the number of times that the snake had
shed its skin by counting the segments that constitute the rattle and thereby
estimate the snake’s age, in actual practice this is fallacious. The rattle is
loosely attached at each of the segments so that the assembly is subject to
periodic breakage; it is not unusual to find a detached rattle segment on the
trail. The conundrum associated with the rattle is that the rattlesnake employs
both aposematism and crypsis simultaneously. The purpose of the rattle is ostensibly to
ward off an attack by a potential predator, an aposematic behavior. However,
their primary predators - which include hawks, owls, coyotes and foxes - are apparently
not put off by the warning of the rattle. King snakes, the preeminent
rattlesnake predators, are immune to the toxins of the rattlesnake. The defensive
behavior of rattlesnakes in the presence of a king snake does not involve the
rattle in any way; the midsection is arched with the extremities held to the
ground in an attempt to club the attacker. Experiments have revealed that the
smell of the king snake triggers this response.
Timber rattlesnakes, for the most
part, are colored with earth tone banded markings to blend with the browns and
blacks of the forest; this is the camouflage of crypsis which can be employed
to deceive prey but is equally useful as concealment from predators. However, it
should be noted that there are at least two different cryptic color variants: the
first is the canebrake rattlesnake, which was once considered a separate
species, - it is more brightly colored to match its cane field habitat; the
second is a much darker, predominantly black variant (photograph) which is an
adaptation to promote nocturnal hunting. The stealth of coloration is enhanced
by the snake’s keeled scales – each having a central ridge to interrupt the
otherwise scintillating sheen of reflectance as is the case with snakes with
smooth scales without keels. The overall effect is that the snake is well
concealed against its prey, but also against its predators. So the fundamental
question remains: why did the rattle evolve?
In The Origin of Species, Charles Darwin was
also perplexed by the peculiar rattle of the American snakes. He wrote that “Having
said thus much about snakes, I am tempted to add a few remarks on the means by
which the rattle of the rattle-snake was probably developed. Various animals,
including some lizards, either curl or vibrate their tails when excited. This
is the case with many kinds of snakes.
Now if we suppose that the end of the tail of some ancient American
species was enlarged, and was covered by a single large scale, this could
hardly have been cast off at the successive molts. In this case it would have
been permanently retained, and at each period of growth, as the snake grew
larger, a new scale, larger than the last, would have been formed above it, and
would likewise have been retained. The foundation for the development of a
rattle would thus have been laid; and it would have been habitually used, if
the species, like so many others, vibrated its tail whenever it was irritated.
That the rattle has since been specially developed to serve as an efficient
sound-producing instrument, there can hardly be a doubt; for even the vertebrae
included within the extremity of the tail have been altered in shape and
cohere. But there is no greater improbability in various structures, such as
the rattle of the rattle-snake.” The improbable evolution of the rattle had
to have a provenance that was unique to the Americas; there are no rattle
snakes anywhere else. There must therefore have been a predatory threat to the
snakes that created the evolutionary rattle warning behavior. It was not human
predation, as the land bridge of Beringia was not traversed to bring them from
Eurasia until about 10,000 years ago. The only reasonable explanation must be
that there was a snake predator among the extinct megafauna of the pre-human
Tertiary Period and that the rattle developed as an effective tool to ward off
that predator, presumably as an indication that the poisonous venom was, while
perhaps not deadly, certainly unpleasant.
The venom of the timber rattlesnake poses a
different evolutionary question that has resulted in some hypotheses as to its
origins. The primary theory is that snakes evolved as large tree dwelling
constrictors in the Miocene Epoch some 30 million years ago. When the climate
changed so as to promote the grassy savannahs, the snakes became smaller and
ground dwelling; some evolved a venomous chemistry for their saliva that
promoted hunting and therefore their fitness to survive. Snake venom evolved as a complex chemistry that
is dominated by proteins; depending on the species of snake, it may have a
predominant neurological effect or a predominant vascular effect. Viper venom
is of the latter category; its most obvious and potentially fatal symptom is
slowing of blood circulation due to coagulation. From the standpoint of its
intended small mammal prey, the venom achieves its objective of immobilization
attendant to consumption. While the venom can be and to some extent is used to
attack predators, it is not very effective. The king snake is immune to
rattlesnake venom and other predators are either unaffected or able to avoid
its application. In Timber Rattlesnakes in Vermont and New York author
Jon Furman provides a firsthand account of a wild turkey holding down a timber
rattlesnake with both feet that was “repeatedly striking at the bird’s long,
armored legs and folded-in wings, but to no avail.” The turkey eventually killed the snake by
cutting it through at the neck and then ate it. Humans are another matter.
In any given year, approximately 45,000 people are
reported to have been bitten by snakes in the United States; 6,000 of these are
from venomous snakes and less than 10 results in fatalities - due almost
entirely to the Eastern and Western variants of the Diamondback Rattlesnake. A
larger number of domesticated animals are also bitten, though the numbers are
of questionable merit as reporting is arbitrary and not required by law. The
symptoms for snakebite vary according to the size of the snake and the amount
of envenomation; about one fifth of poisonous snakebites are inflicted without
the transfer of venom. This may be due to a dearth of venom after a recent kill
or due to an intentional forbearance in order to preserve the venom for a
future kill. The immediate symptoms of envenomation by a rattlesnake include
intense pain at the point of penetration, edema and hemorrhaging. As the venom
spreads through the body in the first few hours, the swelling and discoloration
become more pronounced and systematic cardiovascular distress causes weakness, nausea
and a diminution of the pulse to near imperceptibility. In the worst cases, a
comatose state and death can result. In the twelve to twenty four hour period
that follows, the affected limb suppurates and swells enormously, a condition
that can also lead to cardiac arrest. In most cases, the symptoms abruptly
cease after about three days as the body neutralizes the toxins.
What to do in the case of a poisonous snakebite is
and always has been a matter of some considerable conjecture. Traditionally (the cowboy hero western paradigm), a tourniquet is
established between the bite and the heart to arrest the flow of blood-borne
toxin, the area of fang penetration is
cut open to afford better access, and an oral suction is established to extract
the venom. Snakebite kits were (and probably still are) sold that have a razor
blade and a suction cup to carry out this procedure with some efficacy.
According to current thinking, the cut and suck method does not work very well,
though human trial data is probably nonexistent. But the logic against the cut
and suck method is compelling. Applying a tourniquet concentrates the venom to
a smaller area, where the damage will be more profound. It is actually better
to allow the body to dilute it the venom to diminish its effects. The location
of the penetration is not necessarily where the venom is concentrated, as the
snake’s fangs are long and curved; cutting will likely only result in a greater
potential for infection. Suction is not a good method to remove the viscous
venom, as it will have immediately permeated the tissue to the extent that it
cannot be extracted with a vacuum pressure. The generally accepted procedure at present
tends to a more plausible and less radical approach. After getting the victim
clear of the immediate vicinity of the snake, the bite area should be cleaned
with antiseptic wipes (if available), any jewelry or tight-fitting clothing should
be removed to allow for swelling and the victim should then immediately be
transported to a medical facility for the administration antivenom, which is now
widely available. In the event that the snake bite has occurred in a remote
area, the victim should be transported, either by being carried if possible or by
slowly walking if not to the closest point of egress where medical attention
can be obtained. However, the only certain way to ensure survival from the bite
of a timber rattlesnake is to not get bitten in the first place; if you see a
timber rattlesnake on the trail, give it wide berth.