BROWN TREESNAKE
First detected in the 1950s, an invasive snake has multiplied to more than 2 million on a US territory, wiping out native birds and surprisingly causing another species to boom to levels 40 times higher than on surrounding areas
In the 1940s, the brown tree snake reached Guam hidden in post-WWII cargo and set off a chain reaction that scientists are still measuring today; birds gone, tree seedlings down by up to 92%, and spiders multiplying up to 40-fold on an island that once had neither- Guam forests may be 'irreversibly damaged' by foreign snake species
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