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How did brown tree snakes cause electrical blackouts on Guam?

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The brown tree snake (Boiga irregularis) has caused frequent electrical blackouts on Guam by climbing utility poles and power lines. As an arboreal species, these snakes are highly adept at navigating vertical structures and wires. When they crawl into electrical transmission equipment, their bodies can bridge connections, leading to short circuits and subsequent power outages across the island.12