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18004SNAKE
Australian snake guide

Brown tree snake

Boiga irregularis

Orange-brown with faint bands, big eyes and a narrow neck.

Habitat and distribution

Roofs, sheds and trees across the north and east coast, mostly at night.

Safety

Rear-fanged and not considered dangerous, but it will strike when cornered.

Quick facts

Venom
Rear-fanged and mildly venomous. Not considered dangerous to healthy adults, but bites can still cause local symptoms. Children and anyone unwell after a bite should get medical care.
Size
Usually 1 to 1.5 m, occasionally up to 2 m.
Active
At night. Often comes into houses, sheds and aviaries after birds, geckos and eggs.
Diet
Birds and their eggs, lizards, frogs and small mammals.

Often confused with

Common questions

Is the brown tree snake venomous?

It is mildly venomous with fangs at the back of the mouth. It is not considered dangerous to healthy adults, but it will strike if cornered, so keep your distance.

What is the scientific name of the brown tree snake?

Boiga irregularis. It is sometimes called the night tiger because of its banded pattern and night-time habits.

Where does the brown tree snake come from?

It is native to northern and eastern Australia, including the Kimberley, the Top End, Queensland and north-east New South Wales, as well as New Guinea and nearby islands. It became an invasive pest after being accidentally introduced to Guam.

Why is a brown tree snake in my house?

They climb well and follow birds, geckos and mice into roofs, verandahs and aviaries at night. Close gaps and secure aviaries to reduce visits.

Where it is found

Approximate range based on AROD, adapted to our dot grid. Approximate historical reference range; not a habitat or absence assessment. Listed for 6,879 towns and suburbs. Ranges are approximate and do not confirm occurrence at a particular address.

Call 1800 4 SNAKE (1800 476 253)

If someone has been bitten, call 000. Never approach or handle a snake to identify it.