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Brown tree snake

brown tree snake (Boiga irregularis)
Tully, Queensland
Photo © Stewart Macdonald
Boiga irregularis - (Merrem, 1802)
Pronunciation  boe-EE-gah   ear-REG-you-LAH-ris
Etymology  Boiga: possibly meaningless, but likely referring to Boa, another genus of snakes.
irregularis: 'irregular', referring to the uneven pattern.
Other names  Night tiger
Doll's eye snake
Boiga fusca 
Total length
Species avg: 140 cm
Species max: 200 cm
Clutch size
Average: 6
Range: 6 - 12
Length and clutch size information comes from a variety of sources, but primarily from Shine (1991) and Cogger (2000).
Description Distribution Natural history Conservation Further information More photos


A slender snake with a large, distinct head and bulbous eyes; pupils vertical. Colouration is typically brown to orange-brown with irregular dark bands in the east, or whitish with red to orange bands in the west.

Similar species

Scale count information

Dorsal scales at midbody   19 to 23
Ventrals   225 to 265 with a single anal scale
Subcaudals   85 to 130 and are divided
Other scale information  
Danger rating   Weakly venomous. Small fangs at back of mouth, but large specimens should be treated with caution.
Note: even a bite from a 'virtually harmless' or non-venomous reptile can result in serious complications. Play it safe and don't get bitten by anything.
Notes and disclaimer
This information may not be complete. While all care is taken to ensure the accuracy of the information in this page, primary sources should always be consulted for definitive information. Animals have an endearing habit of disobeying the rules, so the information on this page should be interpreted with a degree of flexibility.
The author and site operator accepts no responsibility for any losses or damages incurred through using this web site or the information contained herein. Don't get bitten by anything!
This page may be cited as:
  Boiga irregularis at the Australian Reptile Online Database. Last updated 2017-04-14 15:14:00.
  Retrieved from on the 30th of May, 2020.
Before citing information contained in AROD, please read our Citing AROD page.

Copyright notice
This page, its content and layout are copyright © 2007-2020 Stewart Macdonald / Ug Media, unless otherwise stated.
All photographs in The Australian Reptile Online Database are © the photographer and may not be reproduced in any form without the express written consent of the photographer.
No part of The Australian Reptile Online Database may be reproduced without written permission from Stewart Macdonald.
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