How to Identify the King Brown Snake (Identification Guide)
The King Brown Snake, also known as the Mulga Snake, is a large, robust Australian elapid identified by its coppery-brown to olive body with a paler head and a thick, muscular build.
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Key identifying features
The King Brown Snake or Mulga Snake (Pseudechis australis) is one of Australia's largest elapid snakes, with a broad, somewhat blunt head only moderately distinct from the neck, round pupils, and smooth, glossy scales. Despite its common name, it is more closely related to black snakes (genus Pseudechis) than to true brown snakes (genus Pseudonaja).
Coloration & pattern
The body color ranges from coppery-brown to olive, tan, or reddish-brown, often with each scale edged in a darker color creating a subtle reticulated or netted appearance. The head is typically a paler cream, yellowish, or pinkish tone compared to the body, a useful field mark. The underside is pale cream or yellow.
Head, eyes & scales
The head is broad and only slightly distinct from the neck, generally paler than the body, with round pupils and smooth, glossy scales that reflect light, giving a somewhat sheen-like appearance.
Size & body shape
This is a large, heavy-bodied elapid, with adults commonly reaching 1.5–2.5 meters (5–8 feet) and occasionally longer, making it one of the largest venomous snakes in Australia by bulk. The body is thick and muscular rather than slender.
Range & habitat where you'll see it
The King Brown Snake is widespread across much of mainland Australia, particularly arid and semi-arid regions, woodlands, and grasslands, and is notably absent from the southeast coast and Tasmania. It shelters in burrows, under debris, or in rock crevices.
How to tell it apart from look-alikes
Its notably paler head contrasting with a coppery or olive-brown reticulated body, combined with its thick, heavy build, distinguishes it from true brown snakes (Pseudonaja species), which are generally more slender with a more uniformly colored head and body. Its large size and robust build also set it apart from many other elapids sharing its arid-zone range.
Frequently asked questions
Is the King Brown Snake a true brown snake?
No, despite the common name, it belongs to the black snake genus Pseudechis rather than the true brown snake genus Pseudonaja.
What is a key identifying feature of this snake?
A pale cream, yellowish, or pinkish head that contrasts with its coppery-brown to olive, finely reticulated body.
How large does it get?
Adults commonly reach 1.5–2.5 meters (5–8 feet), with a notably thick, heavy body.
Where is it found?
Across much of arid and semi-arid mainland Australia, absent from the southeast coast and Tasmania.
How does it differ from true brown snakes?
It has a thicker, more muscular body and a paler head contrasting with its body color, whereas true brown snakes are more slender with more uniform head and body coloring.