Guide
to Florida’s Venomous Snakes |
| This
page is intended to make you aware of the snakes
you may encounter in Florida and so you will
not attempt to kill harmless snakes thinking that
they may be poisonous. You will rarely see any Snakes
but if you do then take great care. Snakes are the
natural habitat of Florida. Like Alligators they
are everywhere. Treat them with respect and under
no circumstances try to kill them. There are only
6 venomous snakes to be wary of. Below is information
that will help you recognise them. |
Although
45 species of snakes are found in Florida, only
the 6 listed here are venomous and a danger to
humans. The remaining 39 species (and 41 subspecies)
are harmless and should be protected for the beneficial
role they play in natural ecosytems, eating insects,
rodents, rabbits, and other small prey.
A word of caution is warranted
here. If you find a snake and you do not know
whether or not it is venomous, the safest thing
to do is leave it alone. Florida snakes are not
aggressive and, unless they are cornered, most
will flee when humans approach. Occasionally,
you might encounter one that is reluctant to leave
because it is basking in the sun to get warm.
Among snakebite victims, an unacceptably high
number are bitten on the hands and arms when they
are handling the snake. Do not catch a snake and
do not handle one unless you are sure it is not
venomous. In addition, for a short time after
a snake is killed, its reflexes may continue to
work. Those reflexes typically cause the body
to writhe slowly for awhile, but they can cause
a convulsive contraction and a bite, so you should
not handle a freshly killed venomous snake.
The only acceptable treatment for
venomous snakebite, involves the use of antivenin.
So if you or someone else is bitten by a venomous
snake, seek immediate medical attention at the
nearest hospital or medical facility. Stay calm,
remove any rings that could restrict circulation
if tissues swell, keep the bitten limb below the
level of the heart, and immediately seek medical
attention. Your most important aids in getting
to a hospital and treatment may be car keys or
a cell phone.
The snake descriptions given below
include characteristics that are relatively easy
for the layman to see, though a few might require
a close look at the snake, so we again caution
you: Do not catch or handle a snake if you do
not know whether it is venomous or harmless. To
keep the descriptions short and simple, other
characteristics known to herpetologists are not
mentioned here.
The six venomous
snakes of Florida
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Southern
copperhead, Copperhead, Highland Moccasin, Chunkhead.
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Scientific
name: Agkistrodon contortrix contortrix.
Description:
Average adult size is 22-36 inches (56-91 cm),
record is 53 inches (135 cm). A stout-bodied snake
with broad, light brown to gray crossbands, alternating
with dark brown to reddish-brown crossbands. Constrictions
along the backbone give the dark bands an hourglass
shape. On the sides of the body the dark bands
usually have light centers, and occasionally one
dark spot. Southern copperheads sometimes have
an overall pinkish tint. The top of head in front
of the eyes is covered with large plate-like scales.
The pupil is elliptical, a catlike vertical slit.
There is a deep facial pit between the nostril
and the eye.
Juvenile color is similar to that of adults, except
that the tail of new born copperheads is bright
sulfur yellow.
Range: In Florida,
this snake occurs only in the panhandle, primarily
along the Apalachicola River and its tributaries,
and then in the western tip of the panhandle.
The FLMNH has specimens in its collections from
Jackson, Liberty, Gadsden, Calhoun, Gulf, and
Escambia counties. The range might extend to other
nearby areas, but there are no confirmed Florida
records from outside these counties. Outside Florida,
the species ranges north to Massachusetts, and
west to Texas and southeastern Nebraska.
Habitat: The preferred
habitat is low, wet areas around swamps, stream
beds, river bottoms, and damp ravines, but it
also occurs on the hillsides above the wet areas.
It also is found in suburban neighborhoods near
people.
Comments: This
beautiful snake is often confused with juvenile
cottonmouths. If you found one in Florida outside
the Apalachicola River valley or the extreme western
end of the panhandle, chances are you have a young
Cottonmouth and not a Copperhead. ‘Copperheads’
are often reported from south Florida, and the
people who found them become quite belligerent
when their mistake is pointed out. The two species
are easy to distinguish because the dark bars
on juvenile Cottonmouths have numerous dark spots
and speckles in them, while the dark bars on the
Copperhead have no dark spots or at most only
one. Also the eye of the Copperhead is not obscured
by the dark facial band typical of the Cottonmouth.
Hatchling copperheads hold the tail erect and
wiggle the yellow tip like a caterpillar to attract
prey within striking range.
Copperhead bites are extremely
painful but usually are not life-threatening for
healthy adults. They can be dangerous to children
or older citizens in poor health. As with all
venomous snakebites, the victim should seek immediate
medical care from a physician or hospital experienced
in treating snakebite. |

Adult |

Juvenile |
Cottonmouth,
Florida Cottonmouth, Cottonmouth Moccasin, Water
Moccasin, Moccasin. |
Scientific
name: Agkistrodon piscivorous conanti.
Description:
Average adult size is 20-48 inches (51-121 cm),
record is 74.5 inches (189 cm). A dark-colored,
heavy-bodied snake. Juveniles are brightly colored
with reddish-brown crossbands on a brown groundcolor.
The dark crossbands contain many dark spots and
speckles. The pattern darkens with age so adults
retain only a hint of the former banding or are
a uniform black. The eye is camouflaged by a broad,
dark, facial stripe. The head is thick and distinctly
broader than the neck, and when viewed from above,
the eyes cannot be seen. The top of head in front
of the eyes is covered with large plate-like scales.
The pupil is vertical (catlike)
Range: Found throughout
Florida. The species extends north to Virginia
and west to Illinois, Missouri, Oklahoma, and
Texas.
Habitat: Any wetlands
or waterway in the state. Cottonmouths can be
found along streams, springs, rivers, lakes, ponds,
marshes, swamps, sloughs, reservoirs, retention
pools, canals, and roadside ditches. It occasionally
wanders far from water, and has been found in
bushes and trees.
Comments: Though
the Cottonmouth occurs throughout the state, it
is not as abundant as the many species of harmless
watersnakes that occur in much the same habitat.
Many Florida residents do not even realize that
watersnakes exist. As a consequence, every large
dark-colored snake found near water is counted,
and usually killed, as a ‘Cottonmouth.’
Cottonmouths can easily be distinguished from
watersnakes. If the head is viewed from above,
the eyes of Cottonmouths cannot be seen while
the eyes of watersnakes are visible; Cottonmouths
have elliptical pupils and watersnakes have round
pupils; Cottonmouths have a facial pit between
the nostril and the eye, and watersnakes have
none.
Some people believe Cottonmouths
lie in wait on tree limbs overhanging water so
they can drop into boats. These are usually cases
of mistaken identity. The harmless brown watersnake
often basks on tree limbs over the water, and
when frightened by a rapidly approaching boat,
they will escape by throwing themselves off the
limb and into the water. Occasionally their flight
comes too late and they fall into the boat. Cottonmouths
feed on fish, frogs, mice, rats, and other small
mammals.
When
threatened, the Cottonmouth may respond by coiling
its body and opening its mouth as though ready
to bite. The exposed white interior of the mouth
is what gave rise to the common name, ‘Cottonmouth.’
If not hard pressed, the Cottonmouth usually will
retreat. This open mouth threat display has led
to the widespread belief that Cottonmouths are
aggressive snakes. In fact, they are one of the
more sedate, even placid, venomous snakes.
Cottonmouth bites can be quite dangerous. The
victim should seek immediate medical care from
a physician or hospital experienced in treating
snakebite.
Juvenile Cottonmouths hold the tail erect and
wiggle its yellow tip like a caterpillar to attract
prey within striking range
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Eastern Diamondback
Rattlesnake, Diamondback, Rattlesnake, Rattler. |
Scientific
name: Crotalus adamanteus
Description:
Average adult size is 36-72 inches (91-183 cm),
record is 96 inches (244 cm). A large, heavy-bodied
snake with a row of large dark diamonds with brown
centers and cream borders down its back. The ground
color of the body is brownish. The tail ends in
a rattle. The tail is usually a different shade,
brownish or gray, and toward the end of the tail
the diamonds fade out or break into bands. The
large and thick head has a light bordered dark
stripe running diagonally through the eye and
there are vertical light stripes on the snout
Range: Diamondbacks are found throughout the state
of Florida, including several offshore islands
and keys, and north along the coastal plain to
southeastern North Carolina and west to southern
Mississippi and eastern Louisiana.
Habitat: Diamondbacks
are often found in pine flatwoods, longleaf pine
and turkey oak, and sand pine scrub areas. These
habitats contain palmetto thickets and gopher
tortoise burrows in which the Diamondback may
seek refuge. Humans have invaded many of Florida’s
pine flatwoods and scrub areas which now contain
farms, homes and shopping plazas. As a result,
the displaced Diamondbacks may be turn up in backyards,
golf courses, and even parking lots.
Comments: This
is a large, impressive, and potentially dangerous
snake. It can strike up to 2/3 its body length;
a 6-foot (183 cm) specimen may strike 4 feet (122
cm). These factors, as well as others, make this
a snake that should be left alone and not molested.
Some people wrongly believe the
Diamondback must rattle before striking. This
is not true. It can lie silent and motionless,
and then strike without the usual nervous buzz
from its rattle. In fact, Diamondbacks that rattle
are more apt to be heard, seen and killed, and
Diamondbacks that remain silent are more apt to
go undiscovered and pass on their genes to the
next generation. In this way, we inadvertently
are selecting for rattlers that do not rattle.
This snake is extremely beneficial
to man because it preys on rats, mice, rabbits,
and other warm blooded prey, many of which are
considered pests. Nevertheless, the general public
in Florida feels so threatened by the Diamondback
Rattlesnake that most are killed on sight. This
indiscriminate killing, combined with the widespread
loss of rattlesnake habitat to agricultural development
and urban sprawl and commercial hunting for rattlesnake
skins, has caused a decline in most Diamondback
Rattlesnake populations. Though not endangered,
the species clearly is in trouble. |
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Timber Rattlesnake,
Canebrake Rattlesnake. |
Scientific
name: Crotalus horridus
Description:
Average adult size is 36-60 inches (76-152 cm),
record is 74.5 inches (189 cm). Can be a large,
heavy bodied snake. The reddish brown stripe running
down the center of the back is disrupted by a
series of large, black, chevron-like crossbands
on the pinkish gray or tan body. The tail is uniform
black. The head is large and sometimes with a
dark diagonal line through the eye or just behind
the eye.
Range: This snake has a very
limited range in our state, found in only 8 or
9 counties in north Florida. It ranges as far
south as Alachua and Dixie Counties and as far
west as Hamilton and Suwannee Counties. There
are verbal reports that this snake occurs in a
few northern counties of the panhandle, but there
are no verified records.
Habitat: Timber
rattlesnakes in Florida prefer low bottomlands
where it is fairly damp, river beds, hammocks
pine flatwoods, swamps, and cane thickets.
Comments: This
snake was once very common and still is in some
parts of its range. Throughout the past it, as
well as other rattlesnakes, has been persecuted
by in rattlesnake roundups, skin shops, and in
senseless killings. The rattlesnakes and other
snakes, are one of our best allies in the fight
to control rodents. They should be respected,
not feared.
This snake should be given
a wide berth and left alone. Because of its cryptic
coloration (camouflage), it can be easily overlooked,
especially if it does not rattle. |
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Dusky Pygmy Rattlesnake,
Pygmy Rattler, Ground Rattler |
Scientific name:
Sistrurus miliarius barbouri
Description: Average adult size
is 12-24 inches (30-61 cm), record is 31 inches
(79 cm). This is a small snake, but very thick
for its size. The top of the triangular shaped
head is covered with 9 large scales. The body
color is light to dark gray. A longitudinal row
of black or charcoal, transverse blotches disrupts
a reddish brown stripe running down the middle
of the back. Dark spots on the side line up with
the blotches. The tail is slender and ends in
a miniature rattle (see photo above). The belly
is heavily mottled with black and white. The pupil
of the eye is vertical (catlike), and there is
a deep facial pit between the nostril and the
eye.
Juvenile coloration is like that of the adults,
but the tip of the tail is yellowish-green.
Range: The Dusky Pygmy
Rattlesnake is found throughout the state of Florida.
The species extends north to eastern North Carolina
and west to eastern Texas and southern Missouri.
Habitat: This
snake is common in lowland pine flatwoods, prairies,
around lakes and ponds, and along the borders
of many freshwater marshes and cypress swamps.
Possibly the habitat in which Dusky Pygmy Rattlesnakes
are most frequently encountered, at least in south
Florida, is the banks of canals running through
marshes and prairies.
Comments: This
small snake has a reputation for being very aggressive.
Its bite, while usually not life threatening,
is extremely painful and can result in the loss
of a digit. Some cases can be fatal. It feeds
primarily on frogs and mice.
The rattle is so small it is seldom
heard. When it is heard, it sounds like an insect
buzzing.
Florida’s two hognose snakes occasionally
are confused with the Pygmy Rattlesnake. However,
it is easy to distinguish between the harmless
hognose snakes and the Pygmy Rattlesnake. The
harmless hognose snakes defend themselves against
potential predators by spreading (flattening)
their heads and necks. If this does not scare
the threat away, the hognose snakes will turn
onto their backs and play dead. The hognose snakes
have upturned noses and round pupils, and they
also have no facial pits or rattles. |
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Eastern Coral
Snake, Coral Snake. |
Scientific
name: Micrurus fulvius fulvius
Description:
Average adult size is 20-30 inches (51-76 cm),
record is 47.5 inches (121 cm). Body ringed with
black, yellow, and red; narrow yellow rings separating
the wider red and black rings. The rings continue
across the belly of the snake. From tip of snout
to just behind the eye the head is black. The
tail is black and yellow, without any red rings.
The red rings usually contain black flecks or
spots. The pupil is round.
The color pattern of the young is the same as
the adults.
Range: The Coral
Snake occurs throughout the entire state including
the northern keys. The species extends north to
southeastern North Carolina and west to eastern
Texas and northeastern Mexico.
Habitat: This
snake occupies a variety of habitats, from dry,
well-drained flatwoods and scrub areas to low,
wet hammocks and the borders of swamps. They are
quite secretive and are usually found under debris
and in the ground, but occasionally they are found
in the open, and have even been seen climbing
the trunks of live oaks. Good numbers of them
are turned up when pine flatwoods are bulldozed,
particularly in south Florida.
Comments: Because
they also are ringed with red, black, and yellow
or white, two harmless snakes in Florida, the
Scarlet Kingsnake and the Scarlet Snake, often
are confused with the Coral Snake. Both of these
mimics (look-a-likes) can be distinguished from
the Coral Snake by their red snouts and red on
their tails. In addition, the red bands of the
Scarlet Kingsnake and the Scarlet Snake never
touch the yellow bands (the red and yellow are
separated by the black). Also, on both the Coral
Snake and the Scarlet Kingsnake the rings go all
the way around the body, but not on the Scarlet
Snake which has a white belly. Both the Scarlet
Kingsnake and the Scarlet Snake are beneficial
and should not be harmed
If you have difficulty separating
the harmless mimics from the Coral Snake, the
following mnemonic rhymes will identify the Coral
Snake for you: ‘If red touches yellow, it
can kill a fellow,’ and ‘If its nose
is black, it’s bad for jack.’
Because the Coral Snake is a relative of the cobras,
people believe its bite nearly always is fatal.
While its bite is serious and should receive immediate
medical attention, statistics suggest that the
bite of the Coral Snake is less threatening than
the bite of a Diamondback Rattlesnake.
Coral Snakes feed on lizards, other snakes, and
frogs |
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