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jekeesl

Snake Patterns

jekeesl (south-central Arkansas)
8 years ago
last modified: 8 years ago

Arkansas has six venomous snakes; Water Moccasins, Coral
Snakes (in 4 southern counties), Copperheads, Pigmy Rattlesnakes, Diamond-back
Rattlesnakes, and Timber Rattlesnakes.
We also have lots of the friendlier types, so I thought that I’d start a
post on snakes for general review. This
first entry will compare non-poisonous watersnakes to Water Moccasins.

We have several species of watersnakes (genus Nerodia) in
Arkansas that are often mistaken for Water Moccasins (a.k.a. Cottonmouths,
genus Agkistrodon). In general, Water
Moccasins are thick-bodied snakes with triangular-shaped heads. They also have thick, relatively short tails,
narrow necks that abruptly transition to the head, a dark horizontal band
across the eye, and vertical pupils.

Watersnakes may look a lot like Water Moccasins at first glance; but
they have less heavy bodies, longer and thinner tails, and roundish eye
pupils. The literature says that Water
Moccasins also have heat-sensing pits that Watersnakes lack. However, that feature is not always easy to
determine in the field.

The first two photos below show what I believe was a
Northern Diamond-backed Watersnake. The
shots were taken on 12/12/2015 along a local lake. I was surprised to see it sunning so late in
the season. You can see its roundish,
somewhat horizontal eye pupil and long, thin tail in the first photo. The second photo shows the lack of a
heat-sensing pit. That feature, based on
Internet descriptions, is usually a bit below, and fairly close to the eye in
Water Moccasins.

The third photo shows a Yellow Bellied Watersnake (or
similar). Although the watersnakes
flatten their heads and bodies, when threatened, this one is in its more
relaxed position.

The fourth and fifth photos show a Water Moccasin on a road
less than a mile from my home. That
snake was more than a half mile from the nearest creek. Note its thick body, short thickened tail,
and vertical pupil. That fifth photo
just shows how happy he was to see me.

The last two photos are of a Water Moccasin on my back
deck. That deck is about 6 feet above
the forest floor, so the snake crawled up brick steps to get there. The surrounding area is a mixed pine and
hardwood forest, with no creeks closer than 300 yards.

I often see Water Moccasins around water, but was surprised
to find them on dry sites. When I later
talked to a Herpetologist, he said that was a common misconception and that
Water Moccasins are sometimes found in dry forests, and even in mountainous regions. Here are the photos…..

Northern Diamond-backed Watersnake (2 photos)

Yellow-bellied Watersnake

Water Moccasin (4 photos)

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