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The brown tree snake (Boiga irregularis) is a species alien to Guam. An aggressive predator, it has caused the extinction of nearly all of Guam’s native bird species. The brown tree snake eats poultry, eggs, and pets. It has extraordinary climbing abilities and causes costly electrical power outages by climbing on power lines. The brown tree snake is mildly venomous: its bite can injure or even kill infants and young children.