Boiga irregularis (brown tree snake)
- Summary of Invasiveness
- Taxonomic Tree
- Distribution Table
- Habitat List
- Biology and Ecology
- Latitude/Altitude Ranges
- Means of Movement and Dispersal
- Pathway Causes
- Pathway Vectors
- Impact Summary
- Threatened Species
- Risk and Impact Factors
- Prevention and Control
- Principal Source
- Distribution Maps
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PicturesTop of page
IdentityTop of page
Preferred Scientific Name
- Boiga irregularis (Merrem, 1802)
Preferred Common Name
- brown tree snake
Other Scientific Names
- Boiga flavescens
- Coluber irregularis Merrem in Bechstein 1802
- Dendrophis (Ahetula) fusca Gray 1842
- Dipsadomorphus irregularis Werner 1899
- Dipsas boydii Macleay 1884
- Dipsas irregularis Fischer 1884
- Dipsas ornata Macleay 1888
- Hurria pseudoboiga Daudin 1803
- Pappophis flavigastra Macleay 1877
- Pappophis laticeps Macleay 1877
- Triglyphodon flavescens Duméril, Bibron & Duméril 1854
- Triglyphodon irregulare Duméril, Bibron & Duméril 1854
International Common Names
- English: brown catsnake; brown treesnake
Local Common Names
- Germany: Braune Nachtbaumnatter
- Guam: culepla; kulebla
Summary of InvasivenessTop of page
Native island species are predisposed and vulnerable to local extinction by invaders. When the brown tree snake (Boiga irregularis) was accidentally introduced to Guam it caused the local extinction of most of the island’s native bird and lizard species. It also caused "cascading" ecological effects by removing native pollinators, causing the subsequent decline of native plant species. The ecosystem fragility of other Pacific islands to which cargo flows from Guam has made the potential spread of the brown tree snake from Guam a major concern.
Taxonomic TreeTop of page
- Domain: Eukaryota
- Kingdom: Metazoa
- Phylum: Chordata
- Subphylum: Vertebrata
- Class: Reptilia
- Order: Serpentes
- Family: Colubridae
- Genus: Boiga
- Species: Boiga irregularis
DescriptionTop of page
Boiga irregularis is a slender, climbing snake with large eyes and a vertical pupil, giving it improved nocturnal vision (Fritts & Leasman-Tanner 2001). The head is considerably wider than the neck. Markings may be either vague or distinct blotches on a brownish-yellow background. In parts of Australia, blue or red banding on a white background may be seen (Rodda 1999). Black speckling may also be present on some individuals. Brown tree snakes are about 38 centimeters at hatching and may reach three meters long, but are usually one to two meters. they are adept climbers and can crawl through very small openings (USDA-APHIS 2001).
DistributionTop of page
Native range: The brown treesnake is native to eastern Indonesia, New Guinea, Solomon Islands and the coastal areas of northern and eastern Australia (Savidge 1987, Rodda et al. 1992, Fritts and Rodda 1998, in Mortensen Dupont & Olesen 2008).
Known introduced range: The population on Guam is the only confirmed breeding population outside of its native range (Stanford & Rodda 2007). Brown treesnake encounter reports come from Micronesia, US Mainland, Hawaii and the Commonwealth of the Northern Mariana Islands (Stanford & Rodda 2007). While encounters have occurred in numerous locations, they tend to be concentrated on a few high-risk islands such as Saipan, Tinian and Oahu (Fritts 1987; Fritts 1988; McCoid & Stinson 1991; McCoid et al. 1994; Fritts et al. 1999, in Stanford & Rodda 2007). The large number of encounters on Saipan has led to speculation that a breeding population may already be established (Colvin et al. 2005).
Distribution TableTop of page
The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.
|Continent/Country/Region||Distribution||Last Reported||Origin||First Reported||Invasive||Reference||Notes|
|Chagos Archipelago||Present||Introduced||Invasive||ISSG, 2011|
|Cocos Islands||Present||Introduced||Invasive||ISSG, 2011|
|Indonesia||Present||Native||Not invasive||ISSG, 2011|
|Japan||Present||Present based on regional distribution.|
|-Ryukyu Archipelago||Present||Introduced||Invasive||ISSG, 2011|
|USA||Present||Present based on regional distribution.|
|Australia||Present||Native||Not invasive||ISSG, 2011|
|Marshall Islands||Present||Introduced||Invasive||ISSG, 2011|
|Micronesia, Federated states of||Present||Introduced||Invasive||ISSG, 2011|
|Northern Mariana Islands||Present||Introduced||Invasive||ISSG, 2011|
|Palau||Absent, formerly present||Stanford and Rodda, 2007; ISSG, 2011||Reported once, not now present|
|Solomon Islands||Present||Native||Not invasive||ISSG, 2011|
|Wake Island||Present||Introduced||Invasive||ISSG, 2011|
HabitatTop of page
In Papua New Guinea where it is native, B. irregularis occupies a wide variety of habitats at elevations up to 1200 meters. It is most commonly found in trees, caves, and near limestone cliffs, but frequently comes down to the ground to forage at night (Fritts & Leasman-Tanner 2001). It hides during the day in the crowns of palms, hollow logs, rock crevices, caves and even the dark corners of thatched houses near the roof (Fritts & Leasman-Tanner 2001). Based on frequent mention of this snake in relation to buildings, domestic poultry and caged birds, the snake is common in human-disturbed habitats and second-growth forests (Fritts & Leasman-Tanner 2001). In part of its native range in Indonesia, it is found in tropical evergreen forests, montane forests, lowland tropical forests, mangroves, montane savanna, wet savanna, seasonal dry forests and closed shrubland. It is also found in human-modified environments, such as deforested land, grassland and croplands (coffee, rice, rubber, coconut, tea and maize cultivations). On Guam, this secretive, nocturnal, and often arboreal snake is found in all terrestrial habitats, but is especially common in forests and human-modified environments (Rodda et al. 2002). The brown tree snake spends most days coiled in a cool and dark location, such as a treetop or a rotted log; it often takes refuge in Pandanus sp. trees (Hetherington et al. 2008). Snakes sighted in the Northern Mariana Islands occured in freshwater swamp forests, herbaceous wetland vegetation, tropical montane savanna, coastal strand vegetation and mangrove forest and in human-modified environments.
Habitat ListTop of page
|Terrestrial – Managed||Cultivated / agricultural land||Present, no further details||Harmful (pest or invasive)|
|Managed forests, plantations and orchards||Present, no further details||Harmful (pest or invasive)|
|Disturbed areas||Present, no further details||Harmful (pest or invasive)|
|Urban / peri-urban areas||Present, no further details||Harmful (pest or invasive)|
|Terrestrial ‑ Natural / Semi-natural||Natural forests||Present, no further details||Harmful (pest or invasive)|
|Natural grasslands||Present, no further details||Harmful (pest or invasive)|
|Riverbanks||Present, no further details||Harmful (pest or invasive)|
|Wetlands||Present, no further details||Harmful (pest or invasive)|
|Scrub / shrublands||Present, no further details||Harmful (pest or invasive)|
|Coastal areas||Present, no further details||Harmful (pest or invasive)|
Biology and EcologyTop of page
The brown tree snake will eat frogs, lizards, small mammals, birds and birds' eggs. In Papua New Guinea, eggs and chicks are regularly consumed, but mammals are more frequently taken (Fritts & Leasman-Tanner 2001). Having nearly depleted the bird populations on Guam, larger snakes have been found scavenging garbage and even sneaking in to steal a hamburger off the barbeque (Fritts & Leasman-Tanner 2001).
Brown tree snakes shift their diet from smaller exothermic prey to larger endothermic prey as they grow from juveniles to adults (Savidge 1988). This is usually seen as a switch from lizards to birds and mammals. Skinks such as Emoia caeruleocauda and Carlia ailanpalai (itself an invasive species) and geckos such as Lepidodactylus lugubris and Hemidactylus frenatus (which are very abundant in human commensal areas) serve as a superabundant food source for juvenile brown tree snakes in Guam. High densities of introduced vertebrates, in particular, the gecko H. frenatus have allowed the snake to attain the high densities seen there (Rodda Fritts & Conry 1992).
The reproductive characteristics of the brown tree snake are poorly known. The female produces four to 12 oblong eggs, 42 to 47 mm long and 18 to 22 mm wide; they have a leathery shell and often adhere together after the shells dry (Fritts & Leasman-Tanner 2001). The female deposits the eggs in hollow logs, rock crevices and other sites where they are likely protected from drying and high temperatures (Fritts & Leasman-Tanner 2001). Females may produce two clutches per year and the timing may depend on climate and prey abundance (Fritts & Leasman-Tanner 2001). Like other snake species, the female may be able to store sperm and produce eggs over several years after mating (Fritts & Leasman-Tanner 2001).
One puzzling result of brown tree snake reproductive studies is that reproductively active males appear to be relatively rare; this is surprising, because female reproductive activity occurs at all times of year in brown treesnakes (F. J. Qualls & C. P. Qualls Unpub. Data, Aldridge 1996 1998, Rodda et al. 1999c, in Rodda et al. 2002). From an adaptive perspective, one would expect males to be able to take advantage of mating opportunities at whatever time of year they encounter a receptive female. Yet reproductively-active males are relatively rare in samples of brown tree snakes (which are collected primarily with food-baited traps). One possible explanation for this phenomenon might be that snakes that are reproductively active are refractory to trap capture. Snake breeders report that male snakes in general avoid eating while they are in reproductive condition (N. Ford Pers. Comm., in Rodda et al. 2002).
Latitude/Altitude RangesTop of page
|Latitude North (°N)||Latitude South (°S)||Altitude Lower (m)||Altitude Upper (m)|
Means of Movement and DispersalTop of page
Introduction pathways to new locations
Aircraft: The brown tree snake is an excellent climber, using minute irregularities to ascend almost any structure, is extremely efficient at entering small openings and hiding in them for protracted periods and can survive for months without food (Perry et al. 1998). This allows it to be accidentally transported in both sea and air cargo (Perry et al. 1998). For example, brown tree snakes can hide in the wheel-wells of planes.
Biological control: The rapid spread of the snake in Guam after 1960 is unexplained. It is plausible that some people might have intentionally spread the snake to suppress rat populations, which were very high on Guam before establishment of the snake (Beardsley 1964, Savidge 1986, in Rodda Fritts & Conry 1992).
Military: Brown tree snakes are associated with large-scale military exercises and cargo moving from Guam to other posts. Guam is a hub for commercial and military shipments in the tropical western Pacific. High levels of transportation with regional and external locations greatly increases the threat of the brown tree snake being transported from Guam to new locations (Stanford & Rodda 2007).
Pet/aquarium trade: Intentional importation may be a relatively minor pathway for brown tree snake dispersal as it makes a poor pet, being drab, secretive and prone to biting (Stanford & Rodda 2007). ). Nonetheless, brown treesnakes were still offered for sale on the internet as late as December 2009.
Seafreight (container/bulk): The attraction of the brown tree snake to small, dark places (Pendleton 1947, in Rodda Fritts & Conry 1992) leaves little doubt that they are potential stowaways in military and non-military cargo (Rodda Fritts & Conry 1992).
Local dispersal methods
Natural dispersal (local): After being introduced into new locations brown tree snakes may spread in an area via natural dispersal.
Road vehicles: Brown tree snakes may be moved around unintentionally in or on vehicles.
Translocation of machinery/equipment (local): Brown tree snakes may be moved around unintentionally in or on translocated machinery.
Pathway CausesTop of page
Pathway VectorsTop of page
Impact SummaryTop of page
ImpactTop of page
Human Health: This rear-fanged colubrid snake is mildly venomous and poses a potential health hazard to infants and young children. It is responsible for one of every thousand hospital emergency room visits on the island (United States Department of Defense 2008). Envenomation of babies has been reported as relatively frequent (Fritts et al. 1990). Besides the direct effects of brown tree snake bites, there is also the danger of increased disease carried by insects that were previously kept in check by Guam's native lizards and birds (Fritts & Leasman-Tanner 2001). Examples of this include an outbreak of dengue fever carried by mosquitoes and a high rate of infant salmonellosis for several years (Fritts & Leasman-Tanner 2001).
Economic/Livelihoods: Power outages caused by snakes have been a serious problem on Guam since 1978, and the incidence of snake-caused outages continues to cause significant problems. The brown tree snake has caused thousands of power outages affecting private, commercial, and military activities, at one stage averaging once every two to three days. While most of these affect a limited area, some are widespread or island-wide blackouts. Everything from school lighting, computers used by retail outlets, traffic signals to refrigeration of perishable goods are subject to these power interruptions. The costs due to direct damages and lost productivity are conservatively estimated at $1 to 4 million dollars each year (Fritts & Leasman-Tanner 2001; Fritts 2002).
A bad perception of the brown tree snake (although it is not harmful to adults) may cause tourists to avoid Guam in favour of more unspoilt locations. Since tourism is only outranked by U.S. military and government in economic importance on Guam, lost tourism dollars could cause major economic stress (Fritts & Leasman-Tanner 2001). Researchers estimate that if the brown tree snake estabishes in Hawaii tourism losses will amount to USD 0.5 to 1.5 billion (D' Evelyn et al. 2008; Rodda & Savage 2007).
Agriculture: The brown tree snake is reported to be an agricultural pest (Fritts & McCoid 1991, in Engeman et al. 2002). Insect species that are no longer naturally controlled by Guam’s native birds and lizards reduce fruit and vegetable yields (Fritts & Leasman-Tanner 2001). Agriculture has continually declined in importance on Guam since 1945, around when the snake was introduced to the island (Fritts & Leasman-Tanner 2001). Agriculture has continually declined in importance on Guam since 1945, around when the snake was introduced to the island (Fritts & Leasman-Tanner 2001), although additional socio-economic factors were very important in this process.
Threatened SpeciesTop of page
|Threatened Species||Conservation Status||Where Threatened||Mechanism||References||Notes|
|Acrocephalus luscinia (nightingale reed warbler)||USA ESA listing as endangered species USA ESA listing as endangered species||Guam; Northern Mariana Islands||Predation||US Fish and Wildlife Service, 1998|
|Emballonura semicaudata rotensis (Pacific sheath-tailed bat)||USA ESA listing as endangered species USA ESA listing as endangered species||Northern Mariana Islands||Predation||US Fish and Wildlife Service, 2015|
|Rallus owstoni (Guam rail)||EW (IUCN red list: Extinct in the wild) EW (IUCN red list: Extinct in the wild); USA ESA listing as endangered species USA ESA listing as endangered species||Guam||Predation||US Fish and Wildlife Service, 2009c|
|Pteropus mariannus mariannus (Mariana fruit bat)||USA ESA listing as threatened species USA ESA listing as threatened species||Guam; Northern Mariana Islands||Predation||US Fish and Wildlife Service, 2009a|
|Zosterops conspicillatus conspicillatus (bridled white-eye)||USA ESA listing as endangered species USA ESA listing as endangered species||Guam||Predation||US Fish and Wildlife Service, 2009b|
|Zosterops rotensis (rota bridled white-eye)||CR (IUCN red list: Critically endangered) CR (IUCN red list: Critically endangered); USA ESA listing as endangered species USA ESA listing as endangered species||Northern Mariana Islands||Predation||US Fish and Wildlife Service, 2007|
Risk and Impact FactorsTop of page Invasiveness
- Proved invasive outside its native range
- Is a habitat generalist
- Benefits from human association (i.e. it is a human commensal)
- Negatively impacts agriculture
- Negatively impacts human health
- Negatively impacts animal health
- Negatively impacts livelihoods
- Negatively impacts tourism
- Reduced native biodiversity
- Threat to/ loss of endangered species
- Threat to/ loss of native species
Prevention and ControlTop of page
BibliographyTop of page
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ReferencesTop of page
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US Fish and Wildlife Service, 2009. Ko'ko' or Guam Rail (Gallirallus owstoni). 5-Year Review: Summary and Evaluation. In: Ko'ko' or Guam Rail (Gallirallus owstoni). 5-Year Review: Summary and Evaluation : US Fish and Wildlife Service.12 pp.
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ContributorsTop of page
Reviewed by: Dr. Gad Perry, Associate Professor, Conservation Biology Texas Tech University, USA.
Principal sources: Rodda et al., 1999; Fritts & Leasman-Tanner, 2001; Mortensen et al., 2008
Distribution MapsTop of page
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