An endangered species takes up residence in the home or workplace, and causes annoyance and trouble for the characters.
One day the main characters find a pest in their home or workplace. However, just as one of them are about shoo it away or, if one of them aren't so merciful, exterminate it, a government official shows up telling them that the animal is endangered and thus killing it or even evicting it would constitute a crime. Now the characters have to deal with an annoying and troublesome pest that they just can't get rid of or even possibly have to actively ensure its safety and well being. Related to this is the White Elephant, in a which a bothersome or simply unwanted gift is received.