This seems to be a quiz question but doesn't seem to be worded correctly as the nickname is mother carey's goose or chickens for the stormy petrel as sequin points out. In your posting in Quizzes you also mention it's the first name of a pop singer...have we got the question right as it's very intruiging?
Full question:-
What female forename is the stage forename of a currently successful pop singer and, in Australia, is a popular nickname for the species of seabird also known as Mother Carey's goose?
Maybe hoping that othr quizmailers will miss this Q & A ?