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Fun Facts
Did You Know?
This is the identification problem that gets diamondback watersnakes killed. Both are large. Both are heavy-bodied. Both live near water. Both flatten their heads when threatened. Both have variable patterns that can look similar
If This Animal Could Talk...
"Watch closely, respect my space, and let my habitat explain the rest of the story."
Diamondback Watersnake:Diamondback Watersnake
The diamondback watersnake is not a cottonmouth. This is the most important thing to know about it, because the second most important thing — that it will bite you, musk you, and possibly defecate on you if you corner it — is mostly only relevant if you ignore the first thing.
A Few More Facts
How they hunt and forage: Fish primarily — sunfish, minnows, catfish, whatever is catchable in shallow water and confined spaces. Diamondback watersnakes are not fast enough to run down healthy fish in open water; they work the edges, the vegetation, the shallows where fish have less room to maneuver. They also eat frogs, tadpoles, salamanders, and occasionally CRAWFISH and small mammals near water. They hunt by sight and smell, actively pursuing prey rather than waiting in ambush. Fish are swallowed head-first, and the swallowing process takes several minutes for anything substantial. The backward-angled teeth that make defensive biting messy are excellent for this — when the snake has a grip on a slippery fish, it doesn't let go.
Live birth or eggs? yes
When young are born: The litter size of 10 to 30 young reflects how many of them don't make it: young watersnakes are small enough to be eaten by almost everything in their habitat, and the survival rate through the first year is low enough that producing many offspring is the only viable strategy.
Photo Gallery
What Is the Diamondback Watersnake Often Confused With?
Young and sub-adult diamondback watersnakes have bold dark blotches on a tan or yellowish-brown background, arranged in a chain down the back where they connect at corners to create diamond shapes. The pattern is clear and easy to see. Older snakes darken progressively. A middle-aged diamondback watersnake is brownish with fading pattern. An old one may look nearly solid dark brown from a distance, though the original pattern is usually visible on close inspection. This darkening is one reason older diamondback watersnakes get killed as cottonmouths more often than young ones — the pattern that makes them identifiable fades as they age, leaving a large, dark, heavy-bodied snake near water that reads as "threat" to anyone not looking carefully. The irony is that older snakes are bigger, have survived longer, are reproductively more valuable to the population, and are the most likely to be mistaken for something venomous and killed.
Drag the handle left and right to compare Diamondback Watersnake side by side with the species it gets mistaken for most.
Open the visual comparison tool
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Accessibility
Accessibility
Diamondback watersnakes are among the more accessible snakes in North Louisiana because they are large, diurnal during spring and fall, and spend significant time basking in exposed positions on logs and branches over water. The basking behavior makes them visible at distances where other snakes would be impossible to spot.
For visitors with mobility limitations, vehicle-based observation from paved refuge roads and boat launches at Lake Bistineau State Park, Black Bayou Lake NWR, and D'Arbonne NWR is productive during spring and fall morning hours. Diamondback watersnakes bask on visible logs and branches over open water, and many of the best observation spots at these refuges are accessible from paved pull-offs and boat ramps. A snake basking 10 feet from the bank doesn't require any trail access to observe clearly.
For visitors who are blind or have low vision, diamondback watersnakes are identifiable by behavior in their presence rather than sound — a companion can describe basking position, response to approach, and whether the snake fled to water, which together build a reliable identification picture. The hissing, if triggered, is loud and directional.
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Frequently Asked Questions
Does Diamondback Watersnake live in North Louisiana?
Yes. Nerodia rhombifer is a large, heavy-bodied, non-venomous watersnake found near lakes, rivers, ponds, bayous, swamps, and marshes throughout North Louisiana. The snake is also dead, in the version of this story that plays out repeatedly across North Louisiana every spring and summer. Diamondback watersnakes are common throughout North Louisiana's wetlands, ecologically useful, and completely harmless to humans from a medical standpoint.
How do you identify Diamondback Watersnake?
Young and sub-adult diamondback watersnakes have bold dark blotches on a tan or yellowish-brown background, arranged in a chain down the back where they connect at corners to create diamond shapes. The pattern is clear and easy to see
What does Diamondback Watersnake eat?
Fish primarily — sunfish, minnows, catfish, whatever is catchable in shallow water and confined spaces. Diamondback watersnakes are not fast enough to run down healthy fish in open water; they work the edges, the vegetation, the shallows where fish have less room to maneuver. They also eat frogs, tadpoles, salamanders, and occasionally CRAWFISH and small mammals near water
Is Diamondback Watersnake dangerous to people?
No. This species is not dangerous to people when it is observed without handling or disturbance
