This parasitic 'vampire fish' that has circular rows of teeth and sucks the blood out of its hosts is making a comeback in the Great Lakes

This parasitic 'vampire fish' that has circular rows of teeth and sucks the blood out of its hosts is making a comeback in the Great Lakes

This sea lamprey being shown at the Royal Ontario Museums Invertebrate Zoology Lab has 150 teeth and serrated tongue.Steve Russell/Toronto Star via Getty Images <ul> <li>Sea lampreys, also known as … [+2793 chars]

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