Clog the piping systems, interfere with locks and dams, damage boat hulls and engines, Feeds on the eggs of many commercial and rare fish, Damages crops; attacks and feeds on livestock, Have been known to even kill pigs or dogs, Spreads rapidly and invades wetlands by displacing native plants, Shallow root system, which has led to landslides, Shades out native vegetation, May sicken or kill small animals (including cats and dogs), Has caused at least 7 species extinctions, Blocks sunlight and robs water of oxygen,

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