Ghoul Rat

Ghoul Rats are found in spooky environments such as the Arbiter's Grounds and Hyrule Castle in Twilight Princess. These invisible will not hurt Link directly, but will cling to him and slow him down significantly which leaves him vulnerable to other enemies. Will will also be unable to jump off ledges at full speed with Ghoul Rats clinging to him, and will sink much more quickly in quicksand.

Ghoul Rats can be detected by transforming into wolf form and using Link's heightened senses. Only by using these senses is it possible to defeat Ghoul Rats, although once they can be seen, they are easy pickings. A single Spin Attack will destroy any rats clinging to Link in wolf form.