Lausenschlange

A Lausenschlange (pronunciation: LOW-zin-shlo-nguh, Grimm: LOW-zin-shlong-guh; Germ. Laus "louse" + Germ. Schlange "snake") is a snake-like Wesen with forked tongues, slit pupils and scaly skin. They strangle their prey with the very strong grip of their arms. Crawford Grimm, one of Nick's ancestors, decapitated one, and after cutting open the Lausenschlange, he found the remains of a brother and sister in its stomach.

Crawford Grimm described them as cowardly and not that dangerous. Interestingly, Monroe contradicted this, stating it was surprising Nick was able to see one and actually live to tell the tale.