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Since arriving in the Great Lakes from Eurasia in the 1980s, zebra mussels have caused havoc for power plants and even entire ecosystems. These mollusks are just one of many invasive species that threaten native animals and habitats. In this informative series, readers will learn about these and other animal invaders, including bullfrogs, killer bees, and Asian carp. The main content addresses science curricula concepts, especially food chains, habitats, and conservation efforts, while fact boxes add and explain more ideas. Vivid, full-color photographs allow budding zoologists to see the creatures up close in their adopted habitats.