Leprechaun

A leprechaun (Irish: leipreachán/luchorpán) is a type of fairy in Irish folklore. They are usually depicted as little bearded men, wearing a coat and hat, who partake in mischief. They are solitary creatures who spend their time making shoes and hiding pots of gold at the end of the rainbow. If captured by a human, they often grant three wishes in exchange for their freedom. Like other Irish fairies, leprechauns may be derived from the gods of extinct pagan religions. Leprechaun-like creatures rarely appear in older Irish mythology, and only became prominent in later folklore.

Leprechaun in The Case of the Toxic Spell Dump
In 1993, EPA desk agent David Fisher was processing a formal request to settle a colony of leprechauns from Eire in the Angels City area. The little men were in hiberniation in the meantime.