Brown Tree Snake
Brown Tree SnakeBrown Tree SnakeBrown Tree SnakeBrown Tree Snake

Brown Tree Snake

Boiga irregularis

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
40–50% · Likely
overall probability at Litchfield National Park
30 Verified records at Litchfield National Park
May Best month highest sighting rate
☀️🌙 Day & Night When it's active Active throughout day and night

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. Wikipedia →

40–50% of wildlife watchers report a Brown Tree Snake sighting in Litchfield National Park, based on 30 days of visitor records from GBIF citizen-science data.

Closest Relatives at Litchfield National Park

Mair's Keelback
LC

Mair's Keelback

🌅 Crepuscular Reptile

Tropidonophis mairii

30–40% · Possible
Slaty-grey snake

Slaty-grey snake

🌙 Nocturnal Reptile

Stegonotus australis

10–20% · With luck
Black Treesnake
LC

Black Treesnake

☀️ Diurnal Reptile

Dendrelaphis punctulatus

10–20% · With luck

📅 Monthly Probability

60–70
Jan
60–70
Feb
50–60
Mar
50–60
Apr
70–80
May
20–30
Jun
20–30
Jul
40–50
Aug
40–50
Sep
50–60
Oct
60–70
Nov
10–20
Dec

☀️🌙 When They're Spotted

Active throughout day and night · across all parks (global)

☀️🌙Day & Night
☀️🌙🌙12am6am12pm6pm12am

Global Distribution

Where this species is recorded worldwide. Restricted to human observations from 2019 onwards — the same kind of record and the same period the probabilities on this page are built from, so collar-tracking studies, camera-trap arrays and museum specimens are excluded. Around Santa Rosa that removes 5,924 GPS fixes from a handful of tagged jaguars.

where this species is recorded (GBIF density — it tracks where observers go, not how likely a sighting is)  ·  parks where it occurs — tap a pin for the sighting probability there

Parks Where Found

# Park Country Probability
1 Litchfield National Park 🇦🇺 Australia
40–50%
2 Daintree National Park 🇦🇺 Australia
30–40%
3 Kakadu National Park 🇦🇺 Australia
20–30%
4 Nitmiluk National Park 🇦🇺 Australia
20–30%
5 Lamington National Park 🇦🇺 Australia
10–20%
6 Springbrook National Park 🇦🇺 Australia
10–20%
7 Noosa National Park 🇦🇺 Australia
Insufficient data
8 Lorentz National Park 🇮🇩 Indonesia
Insufficient data
9 Royal National Park 🇦🇺 Australia
Insufficient data
10 Blue Mountains National Park 🇦🇺 Australia
Insufficient data

Quick answers

What are the chances of seeing a Brown Tree Snake in Litchfield National Park?

About 49% of wildlife watchers report a Brown Tree Snake sighting in Litchfield National Park, based on 30 days of visitor records from GBIF citizen-science data.

When is the best time to see Brown Tree Snake in Litchfield National Park?

May has the highest sighting rate for Brown Tree Snake in Litchfield National Park in our monthly data.

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