
Elapidae
Western Brown Snake
Pseudonaja mengdeni
A slender inland brown snake with yellow, orange or brown body forms and variable dark markings.
Venomous
Identification and appearance
Yellow-to-orange and brown forms occur. Dark scale edges can create a net-like effect, and some snakes have broad or faint bands across the body. Head and neck colours vary between forms.
Other names
Mengden's brown snake, Gwardar
Typical length
AROD reports an average length of about 100 cm. No typical adult interval or species-specific maximum is established here.
Body build
slender
Head appearance
Head and neck may be dark or pale, depending on colour form
Key identification features
- slender body
- yellow/orange or brownish body forms
- reticulation or variable bands
- pale head and grey nape markings can occur
Where it is found
The described range runs from Carnarvon in Western Australia to Mootwingee National Park in western New South Wales. The broader state list also includes Queensland, South Australia and the Northern Territory.
Diet
Small mammals, ground-nesting birds and lizards.
Reproduction
Egg-laying.
Medical significance
The Australian Museum warns that bites from brown snakes are potentially life-threatening. Treat any suspected bite as a life-threatening emergency. Call 000 for an ambulance and do not wait for identification.
What to do if you encounter one
Keep well clear and leave a route towards cover. Do not chase, corner, handle or inspect it. If it is inside a building, keep people and pets away and contact a qualified local snake remover.
Similar-looking snakes
Other brown snakes can look similar; variable banding and head colour do not establish a safe identification.
Taxonomy notes
Older broad use of Pseudonaja nuchalis is not treated as interchangeable with the current species P. mengdeni.
Sources checked
- Australian Reptile Online Database — Western Brown Snake (2026-09-25)
- The Reptile Database — Pseudonaja mengdeni (2026-09-25)
- Australian Museum — Western brown snakes (2026-09-26)
- ANZCOR — Australian snake bite first aid (2026-09-26)
- University of Melbourne AVRU, Brown snakes (2026-09-26)
Still not sure?
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A profile is a guide, not a reason to approach or handle a snake.
