The spotted mulga snake ('Pseudechis butleri' ), also known commonly is a species of venomous snake in the family Elapidae. The species is endemic to Western Australia. It is a member of the genus 'Pseudechis,' dangerously venomous snakes that can intimidate an opponent by raising the head and presenting a hood. This cobra-like threat display is supported by the ability to produce a very large amount of venom.

It is a species of the 'Pseudechis,' a genus of large front-fanged venomous snakes. The species is similar to the common mulga 'P. australis,' a larger and widespread snake which occurs in sympatry at parts of central Western Australia.

It is spotted with yellow or yellow-green scales and does not usually exceed a total length (including tail) of 1.6 m (5.2 ft). The snout-to-vent length (SVL) is up to 1.56 m (5.1 ft), and the tail length is around 15% of the SVL. The dorsal scales of the body are occasionally all black, but most of the upper body is covered in yellow or brownish scales with black bases. The colour of the head and neck tends to completely black. The neck is slightly defined from the head, broad and slightly larger than the robust body.

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