What was the reason for the extirpation of the nightingale reed warbler?

The nightingale reed warbler (Acrocephalus luscinius), or Guam reed warbler, is an extinct song bird endemic to Guam. The nightingale reed warbler was driven to extinction by several introduced species. These included the brown tree snake which has also decimated the populations of several other bird species on Guam. Other introduced predators included rats, cats and feral ungulates such as goats or sheep.