Flea
From Memory Alpha, the free Star Trek reference
A flea is a type of insect commonly found on Earth.
Leonard McCoy described the HMS Bounty as a "Klingon flea trap." James T. Kirk, however, reminded him that they "could learn a thing or two from this flea trap," because it possessed a cloaking device. (Star Trek IV: The Voyage Home)
Other types of fleas not commonly found on Earth include:
