Field Trip Essay #4: United States Geological Survey: Guam Brown Tree Snake LaboratoryThe Brown Tree Snake (BTS) is an introduced or invasive species, which means that it is not a native or indigenous species to Guam. The BTS is native to Australia, Papua New Guinea, and the Solomon Islands. During World War II, this area was a hotspot for military bases. Between the late 1940s and early 1950s, the brown tree snakes were likely stowaways in military cargo that originated from thosemilitary bases. Since then, they have cause numerous problems to the economy and ecology of Guam. In the past, they have been known to cause power outages, and although their venom is known not to be harmful to humans, they have been known to cause death to infants by constriction. Prior to the BTS arrival, Guam used to be populated by many birds only known to the island. Before, Guam was home to more than 10 species of indigenous birds and now, it is down to 3-4 species.