Weasel
A weasel was an Earth mammal, also used as an insult to imply one was sneaky and self-serving.

In 2380, Ensign Beckett Mariner told Brad Boimler that she had believed he was an "ambitious little weasel" before adopting him as her mentee. ()

See also 
 Ermine
 Mink
 "Pop Goes the Weasel"

External link
 
Earth animals
Insults