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Brown Tree Snake

Scientific name
Boiga irregularis

NT Conservation Status

status least concern
Brown Tree Snake

Distribution map
Distribution Map Brown Tree Snake

Length Up to 2 metres.

Factsheet Brown Tree Snake PDF (653.2 KB)


A nocturnal, arboreal, rear-fanged colubrid snake possessing two small grooved fangs at the rear of the mouth. They have a bulbous head, narrow neck and large eyes with vertical pupils. Colour variations include cream to reddish brown with dark bands and orange to salmon underbelly.


The Brown Tree Snake preys upon birds, lizards, bats, rats, and small rodents. It is mildly venomous but not regarded as dangerous to humans.


Females produce 4-12 oblong eggs and may have up to two clutches per year. Eggs are laid in hollow logs, rock crevices, and other sites where they are likely protected from drying and high temperatures.


Extends from the Kimberley, Western Australia to just south of Sydney, New South Wales. It inhabits woodlands, mangroves and rainforests.


Habitat loss, fire, feral dogs, humans, feral cats

Brown Tree Snake in handEggs Brown Tree snakeHatchling Brown Tree Snake

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