What changes have been observed since the brown tree snakes have been introduced?

Since the introduction of brown tree snakes to Guam, significant ecological changes have occurred, particularly in the decline of native bird populations, with many species becoming extinct or severely reduced. The snakes have also impacted the island's ecosystem by preying on small mammals, reptiles, and native birds, leading to a shift in the food web. Additionally, the presence of these invasive snakes has resulted in increased economic costs related to their management and control, particularly concerning power outages caused by snakes entering electrical infrastructure.