LAMPREY is a speedy, eel-like animal, 30–90 cm in length, inhabiting the cool depths of coastal waters. It migrates up rivers and streams to spawn in fresh water, and it constructs small nests by moving rocks with its mouth. The lamprey has no jaws but attaches itself to its prey—HERRING and SALMON are preferred—with a sucker mouth surrounded by teeth. With its rasping tongue the lamprey creates a raw wound, through which it draws sustenance from its host. Of 30 known species, 4 occur on...

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