Pippinella is special in that she possesses what is generally assumed to be an exclusive trait of male canaries: birdsong. Ultimately, Doctor Dolittle creates a "Canary Opera" (using canaries and other bird species as well), based on Pippinella's life story.
Pippinella is distinguished by her possession of a trait commonly believed to be exclusive to male canaries: birdsong. Later, Doctor Dolittle develops a "Canary Opera" (featuring canaries and other bird species) inspired by Pippinella's biography.