They latch on with rows of razor-sharp teeth, drain fish of their blood, and nearly brought the Great Lakes ecosystem to its knees. Here’s how a groundbreaking scientific effort helped stop one of the world’s most destructive invasive species. #calltoearth Tap the link in bio for more. 📸 : 1,4,6. GLFC; 2. E. Marsden, UVM; 7. Kilian Fichou/AFP/Getty Images