Pacific Rattlesnake Crotalus oreganus
Northern Pacific Rattlesnake Crotalus oreganus-same snake, here with a slightly different appearance and common name
The Prairie rattlesnake Crotalus viridis
viridis, is the only venomous snake in the Canadian prairies.
It can be found in
south western Saskatchewan and south eastern Alberta. In the United States of the Americas, its
range extends from Idaho and Montana, to western Iowa, and northern Mexico.
All three of the above images are public domain.
There is no copyright and nobody has any legitimate claim of ownership
Contrary to what you have seen in John
Wayne and other “Western” movies,"American" action, and/or war, movies; when it comes to fight or flight a snake will always choose flight. There are no snakes, of any type, anywhere in the world, that will attack a human; or any other large animal, unless they are provoked and feeling in mortal danger. And, despite what you saw in the movie True Grit,the chances of you dying from; or even suffering
a snake bite, anywhere in North America; but, especially in Canada, are very
rare, indeed. Although there are still claims that if
has happened; warm sleeping human bodies are not really known to attract snakes
–of any kind. There has never been a proven case of a snake ever crawling into an occupied sleeping bag.
The exaggerated fears of rattlesnakes arise, mainly, from such equally
exaggerated stories of their prevalence, their viciousness, and the inevitable
fatalities from their bites.
In truth, snakes are rarely as
common as people think; and, they are timorous creatures that will bite human beings
only if hurt, or, frightened; and a bite is rarely fatal, if properly treated. In
1803, it was said that if the travellers’ tales of the danger from rattlesnakes
were true, the Americas, including the United States thereof, would be
uninhabitable."
Rattlesnakes are a group of venomous
snakes of the genera Crotalus and Sistrurus of the subfamily Crotalinae
("pit vipers"). There are thirty two known species of rattlesnakes, and
between sixty five and seventy subspecies. Ranging from southern Alberta and southern
British Columbia in Canada to Central Argentina in South America; all are native
to the Americas,
Yes, rattlesnakes
are predators, hunting small animals such as birds and rodents that live in a
wide array of habitats.
Yes, they kill their prey with a venomous
bite, rather than by constricting. All rattlesnakes possess a set of fangs with
which they inject large quantities of hemotoxic venom. The venom travels
through the bloodstream, destroying tissue and causing swelling, internal
bleeding, and intense pain. Some species, such as the Tiger Rattlesnake and the
Mojave Rattlesnake, additionally possess a neurotoxic component in their venom
that causes paralysis and other nervous symptoms.
Yes, rattlesnake bites are the leading
cause of snakebite injuries
in North America. However, rattlesnakes rarely bite unless provoked or
threatened; and, if treated promptly, the bites are rarely fatal.
The Tiger Rattle Snake (Crotalus tigris)
is a highly venomous pit viper species found in the south western United States
and north western Mexico. No subspecies are currently recognised. The
specific name, tigris, Latin for "tiger", refers to the many narrow
dorsal cross bands, which create a pattern of vertical stripes when viewed from
the side. Tiger rattlesnakes are easily identified by their small, spade shaped
head, which is about 1/25 of their total body length. They have the smallest
head of any rattlesnake and a large rattle. The Prairie
Rattlesnake Crotalus viridis, (common names: prairie rattlesnake, western
rattlesnake, plains rattlesnake) is a venomous pit viper species native to the
western United States of the Americas, south western Canada, and northern
Mexico. Currently, two subspecies are recognised.
The Pacific Rattlesnake Crotalus oreganus,
(common names: include western rattlesnake, northern Pacific rattlesnake,
Pacific rattlesnake, black rattlesnake, Arizona diamond rattlesnake, black
diamond rattlesnake, black snake, California rattlesnake, confluent
rattlesnake, diamond-back rattlesnake, Great Basin rattlesnake, Hallowell's
rattlesnake, Missouri rattlesnake, Oregon rattlesnake, Pacific rattler,
rattlesnake, southern rattlesnake, western black rattlesnake, western rattler
and north Pacific rattlesnake.) is found in North America from south western
Canada, through much of the western half of the United States of the Americas,
and south into northern Mexico.
In Canada, it is found in southern
British Columbia. In the United States of the Americas, it occurs in several
states, including: Washington, Oregon, western and southern Idaho, California,
Nevada, Utah, Arizona, and likely west-central New Mexico.
In northern Mexico, it is found in western
Baja California and the extreme north of Baja California Sur, from sea level to
an altitude of 2,500 m (8,200 ft).
The threat of envenomation, advertised by
the loud shaking of the titular noisemaker ("rattle") at the end of
their tail, deters many predators. However, rattlesnakes fall prey to hawks,
weasels, king snakes, and a variety of other species. Rattlesnakes are heavily
preyed upon as neonates, while they are still weak and mentally immature. Very large
numbers of rattlesnakes are killed by ignorant, misinformed, (usually
movie addicted), humans. Rattlesnake populations in
many areas are severely threatened by habitat destruction, poaching, and
extermination campaigns.
Public Domain Image, No Copyright and No legitimate claim of private ownership.
The Massasauga Rattle
snake
(Sistrurus catenatus) is a stout-bodied rattlesnake, usually about 50 to 70
centimetres long. It is Ontario’s only venomous snake, though like all rattle
snakes, IT
WILL ONLY BITE IN SELF-DEFENCE IF IT IS THREATENED OR HARASSED.
It has a triangular head and a tail that ends in a small rattle that creates
a buzzing sound when the tail shakes. The body is grey to dark brown with
darker brown “butterfly” or “saddle-shaped” blotches down the back, with
alternating blotches along the sides. The Massasauga
is the only Ontario snake with a vertical (cat-like) pupil. Appreciate
snakes and don’t harm them. Sadly, the deliberate killing of snakes by humans
is a significant threat to the Massasauga and other Ontario snakes. Human
persecution led to the eradication of the Timber Rattlesnake from Ontario.
Rattlers are too slow to outrun or dodge
even the slowest of their enemies, thus the need for good long-range vision
Rattlers have good vision to at least 15
feet away under moderate illumination. The eyes are set so far to the sides of
the head that they have only a limited field of binocular (stereo) vision. This
may result in their moving their head from side to side as they try to get a
good picture of something.
Like all snakes, rattlers do not have
external ears or all of the usual internal ear structures; instead they feel
vibrations transmitted through the ground, though more recent research
indicates that many snakes are able to hear airborne sounds as well.
Rattlers tend to bask near an escape hole
- a rocky crevice or animal burrow - to which they can go when they feel
threatened. Their other methods of defence, in order of general preference,
includes procryptic (their protective colouring enables them to blend into the
background especially when the snake is absolutely motionless); rattling;
flight - escaping down it's bolt hole or just away from the disturbance;
withdrawing its body into a flat (along the ground) coil, hissing and rattling;
drawing up into a striking coil, hissing and rattling; lastly,
striking.
The amount of venom injected into a bite
is variable depending upon a number of factors - the age of the snake and how
it perceives the threat; whether or not the snake has just envenomed prey, etc.
Historically, mortality rates remain pretty much the same - only slightly less
than 3% of bites are fatal. Even so, the fatality generally is
caused by secondary infection, alcohol poisoning, being bitten repeatedly
and/or by multiple snakes, or allergic reaction to the venom.
Symptoms
of an envenomed bite include: immediate pain, swelling and discolouration,
weakness and giddiness, difficulty breathing, nausea and vomiting, haemorrhaging
from the wound site, circulatory disturbance such as rapid, fluttery or thready
pulse and a drop in blood pressure. Bites on face or neck may result in
difficulty in swallowing, numbness of lips and tongue, excessive thirst and
cold sweats. Note: Many of these symptoms are symptoms of general
shock and/or panic, and are not uncommon in the case of a phobic person who is
terrified of all wild animals (or who believes that all snakes are venomous)
who is bitten by an otherwise innocuous non-venomous snake or generally
harmless animal.
However, when out
walking, hiking or camping, in snake country, precautions should,
always, be taken; from early morning to late evening, as temperature, season
and humidity can all affect just when rattlers will be active.
To prevent bites, take precautions such as
wearing protective pants and boots, and look where you are walking and sticking
your hands. Bites commonly occur in the following instances: picking berries or
flowers; picking up kindling or firewood - even from neatly maintained stocks
of firewood; reaching into brush to pick up animals or rocks, etch.; reaching
blindly into tree hollows and animal burrows; turning rocks; climbing rocks,
especially reaching for hand and toe holds without looking; walking and hiking
through brush without protective clothing; cutting thick brush; picking produce
from a heavily grown-over garden; moving around in the dark, picking up and
moving things.
Do's and Don't s:
· Don't
move planks, rocks or logs by hand - use a stick or crowbar until you can see
under it.
· Don't
gather firewood in the dark. Do it in the daylight, or at night under
well-lighted conditions.
· Don't
reach into holes in the ground, rocks or trees, woodpiles, even abandoned
buckets and tires.
· When
walking, stay in cleared areas (paths) as much as possible, and keep a visual
and auditory look-out for rattlers.
· Take
most care when the temperatures are moderate, not only when they are very hot
or cold.
· Use
a flashlight when moving about at night.
· Step
on a log, not over it, so you can first look down to make sure there is nothing
concealed on the other side.
· If
possible, avoid walking to close to rocky ledges.
· Never
put your hands and feet where you can't see them.
· When
crawling under a fence, beat the grass or brush first to assure there is no
snake lying there.
· Look
around
before you sit on a rock or log.Learn to recognize the venomous snakes.
· Avoid
killing all animals(even rattlers have an important environmental niche they
fill), but at all costs, avoid killing non-venomous ones.
· When
you hear a rattle, freeze until you identify where the sound is coming from;
you don't want to accidentally step on it when trying to flee. Once you have
spotted it, give it time to
move away. Normally, they will flee, if, given the opportunity.
· Then,
if it doesn't, move slowly straight away from it; don't
walk to one side or the other as that could be perceived as threatening. Look
behind you before you start to walk backwards - you don't want to trip over a
rock, or another snake.
· Does
not tease, molest, or harass any animal.
· Snakes
cannot close their eyes. Therefore you cannot tell if they are asleep.
· If
you come across a snake, please don’t try to capture it, handle it or kill it.
Snakes can be delicate and improper handling can cause serious injury. Also,
certain species are protected under legislation, which makes it illegal to
harass, harm or kill them. Be respectful and observe from a distance.
· Don't handle a
dead or injured snake. Dead snakes may not really be dead. Muscle contractions
can still cause envenomed wounds, even when handling the decapitated head of a
rattler.
Rattlers cannot move fast enough to
overtake a person who wants to get out of its way. The
only danger is that the person falls or trips in
getting away, thus disturbing another snake, or falls towards the rattler
rather than away.
Spring is the period of greatest activity.
Emerging from winter hibernation, they are hungry and looking for mates, as
this is also the breeding season. During this time they will eat prodigiously.
Males are looking for females to court, and will battle competing males. During
these times of stress, when trying to eat, and when in their opaque stage
several days before they are ready to shed, is when they are most likely to act
in an aggressive manner-but, only when disturbed.
Snakes migrate to and from their winter
denning site, so aggregations of them may be found during a short period of
time during the spring and fall. Dens are usually in rocky outcroppings in the
hills, or in deep animal burrows. They are not good tree climbers, but many are
good swimmers.
It is often, mistakenly,
(again usually by movie addicts), believed that rattlers are active only during
the heat of the day.
Not only do they, always, rest, during the
heat of the day, sheltered from the sun, they are adept hunters in the dark,
their heat pits and sense of smell guiding them to prey. During periods of
excessive heat during the day, many diurnal animals become corpuscular (active
at dawn and dusk) or partially nocturnal. Thus rattlers are more nocturnal in
summer than during the spring or fall, and adults are more nocturnal than
juveniles.
Despite their need for heat to be able to
function, rattlers can function at surprisingly cold temperatures - especially
the Mojave rattlers and sidewinders.
Rattlers' preferred habitats include
(depending upon species) deserts, grassy plains, and brushy and rocky hills. In
addition, there needs to be a suitable amount of prey, proper climate for the
species, and places to hide and hibernate.
Rattlers' main prey is small mammals.
Those that live near areas with large populations of amphibians will also feed
extensively on them. Others will feed on the eggs of ground nesting birds. Know
your local wildlife!
© Al (Alex, Alexander) D. Girvan. All rights reserved.