Brown Tree Snake

brown tree snake, (Boiga irregularis), also called brown catsnake or culepla, slender, mildly venomous, primarily arboreal snake of family Colubridae that is considered to be one of the most aggressive invasive species in the world. The brown tree snake is native only to the islands immediately west of Wallace’s Line and to New Guinea and the northern and eastern coasts of Australia; however, its geographic range has expanded significantly and now includes Guam, Saipan, and other islands of the western Pacific. Although it is most commonly found in tropical forests and grasslands, it may occur in other tropical habitats, including urban ecosystems, up to elevations of about 425 metres (about 1,400 feet). The species is also known for its ability to decimate populations of small vertebrates in the habitats it colonizes.