Diamondback Water Snake
Nerodia rhombifer
A large, heavy-bodied water snake with a distinctive dark, diamond-shaped netlike pattern on an olive-brown background.
- Venomous?
- Non-venomous
- Adult length
- 0.75-1.5 m (2.5-5 ft)
- Range
- South-central United States
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Overview
The Diamondback Water Snake is one of the largest of the North American water snakes, found throughout river systems and wetlands of the south-central United States. Its bold, net-like diamond pattern distinguishes it from other Nerodia species.
It is a strong swimmer well adapted to life in and around large rivers, lakes, and reservoirs.
How to identify it
- Large, heavy body, olive-brown to yellowish-brown in color
- Dark, diamond- or chain-like netted pattern down the back
- Keeled scales giving a rough texture
- Round pupils
- Distinguished from other water snakes by its larger size and distinctive diamond netting pattern
Habitat & range
Found in large rivers, lakes, reservoirs, sloughs, and swamps throughout the south-central United States, especially the Mississippi and Rio Grande drainages.
Behavior, diet & reproduction
Primarily nocturnal to crepuscular, often seen basking on branches overhanging water during the day. Feeds heavily on fish and amphibians. Can be defensive when handled but is non-venomous. Bears live young.
Frequently asked questions
Is the Diamondback Water Snake venomous?
No, it is non-venomous and harmless, though it can bite defensively.
How large does it get?
It is one of the largest North American water snakes, with adults commonly exceeding 1 m (3.3 ft).
What is its distinguishing pattern?
A dark, diamond- or chain-like netted pattern on an olive-brown background.
Diamondback Water Snake guides
In-depth guides for identifying and understanding Diamondback Water Snake.
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