Boiga irregularis


The Brown Tree Snake has a slender body and a broad head which is noticeably wider than its narrow neck. The eyes are large with vertical pupils. In eastern populations, the colour of the back and sides are greyish-brown to reddish-brown with irregular dark-brown or blackish bands. In the north-western populations , the colour of the back and sides is cream or yellowish with strongly contrasting brown to reddish crossbands.


The Brown Tree Snake occupy coastal and adjacent regions of northern and eastern Australia, their range extends from around Sydney in New South Wales to Cape York Peninsula in Queensland and across the northern coast of the Northern Territory to Derby in on the Western Australia's north coast.


The lifespan of many of our reptiles has not been studied in great detail, many are considered to live an average of 20 - 30 years.


The average size of the Brown Tree Snake is 1.4 metres however they are quite regularly found at 2 metres in the north.


Mammals , birds and their eggs, lizards and frogs.


The Brown Tree Snake inhabits rainforests, sclerophyll forests, humid woodlands, mangrove forests, rocky outcrops and occasionally buildings.


A female Brown Tree Snake lays 3 - 11 eggs in moist soil deep in a rock crevice or in the decomposing interior of hollow timber.



Although the Brown Tree Snake is venomous, it's bite is not dangerous to humans.