Brown Tree Snake

Brown Tree Snake

Boiga irregularis

Silhouette: Alex Slavenko · PhyloPic

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
Daily sighting probability Insufficient data
at Noosa National Park
2 Verified sightings at Noosa National Park From 2019 to 2026
249 Verified sightings across all 11 parks From 2019 to 2026
☀️🌙 Day & Night When it's spotted Active throughout day and night

About the Brown Tree Snake

The brown tree snake (Boiga irregularis), also known as the brown catsnake, is an arboreal rear-fanged colubrid snake native to eastern and northern coastal Australia, eastern Indonesia (Sulawesi to Papua), Papua New Guinea, and many islands in northwestern Melanesia. The snake is slender, which facilitates climbing, and can reach up to 2 metres in length. Its coloration may also vary, some being brown, green, or even red. Brown tree snakes prey on a wide range of animals, from invertebrates to birds and even some small mammals. It is one of the very few colubrids found in Australia, where elapids are more common.

Due to an accidental introduction after the events of World War II, this snake is now infamous for being an invasive species responsible for extirpating the majority of the native bird population in Guam. Currently, efforts are being made to reduce and control the population on Guam and prevent the snake from spreading to other locations. Researchers are employing various methods, including aerial baiting, to attempt to control the population, while multiple agencies continue to fund and support the species' removal.

The brown tree snake is a nocturnal, arboreal... Wikipedia →

Global Distribution

Warmer areas are where this animal is recorded most often.

Parks Where Found

# Park Country Daily sighting probability
1 Litchfield National Park 🇦🇺 Australia
~50%
2 Daintree National Park 🇦🇺 Australia
~40%
3 Kakadu National Park 🇦🇺 Australia
~30%
4 Tangkoko Nature Reserve 🇮🇩 Indonesia
~30%
5 Raja Ampat 🇮🇩 Indonesia
~30%
6 Nitmiluk National Park 🇦🇺 Australia
~30%
7 Lamington National Park 🇦🇺 Australia
~20%
8 Springbrook National Park 🇦🇺 Australia
~20%
9 Noosa National Park 🇦🇺 Australia
Insufficient data
10 Royal National Park 🇦🇺 Australia
Insufficient data
11 Blue Mountains National Park 🇦🇺 Australia
Insufficient data
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