I would probably consider them more like a tapeworm. Most people don't know if they have one but it feeds off of you while slowly killing you from the inside... Like what they do to all of their host nations that are too dumb to kick them out.

>The lamprey eel, also known as the sea lamprey, is a primitive, eel-like fish that invaded the Great Lakes in the early 20th century through shipping canals.2 They have an eel-like body with two close dorsal fins, seven gill openings, and a large round mouth with sharp, curved teeth and rasping tongue.1 The adult lamprey may be characterized by a toothed, funnel-like sucking mouth.0 Despite their similar body shape, the lamprey and eel are not even closely related, with lampreys being more closely related to hagfish and sharks.

Quite similar indeed