OldManZone Presents
Guam Invasive Species
Learn how invasive species are reshaping our island and what you can do to help.
10 of Guam’s 12 native forest bird species have disappeared due to the brown tree snake[1].
The brown tree snake causes $1–4 million in annual damage to Guam’s electrical grid, triggering frequent outages[2].
Asian cycad scale has killed over 90% of Guam’s native cycads since 2003, wiping out century‑old trees[3].
Invasive species cost Guam more than $5 million each year in documented losses—and the true cost is higher[4].
Guam’s unique ecosystems evolved in isolation for millions of years. When invasive species arrive, they often have no natural predators and can spread quickly, overwhelming native plants and animals. The brown tree snake, coconut rhinoceros beetle, and other invaders have already pushed many native species to the brink of extinction and threaten our island’s cultural heritage and economy. This website is a resource for students, teachers, and community members who want to understand the problem and be part of the solution.
Discover the most pressing invasive species on Guam today and how they are impacting our ecosystems and economy.
Dive into detailed profiles of the invaders—from snakes to beetles to ants—and understand their biology and impacts.
Learn from past mistakes and successes in Guam’s efforts to combat invasive species, and how these lessons inform today’s strategies.
Explore cutting‑edge technologies—from environmental DNA to AI monitoring—that offer hope for a healthier Guam.