The roles of Black Canary and Huntress are up for grabs.

Warner Bros. is looking to fill out its aviary for Birds of Prey. The DC feature project, which is being toplined by Margot Robbie as the anti-heroine Harley Quinn, is narrowing down the actress who will play heroines Black Canary and Huntress, among several others. Sources tell The Hollywood Reporter that Gugu Mbatha-Raw, who starred in Belle and appeared in Ava DuVernay's A Wrinkle in Time, and Jurnee Smolett-Bell, who appeared on the critically acclaimed WGN series Underground and recently booked a lead in HBO’s Lovecraft Country, are in the mix for Black Canary. Hidden Figures star Janelle Monae was also said to be in the running, but it is unclear if she tested for the role.

Watch DC Film 'Birds of Prey' Narrows Down Candidates for Black Canary and Huntress | THR News Canary, who is an expert fighter that is known for her “canary cry," has traditionally been white in the comics, but Warners is looking for diverse talent for Birds of Prey. For the role of Huntress, Margaret Qualley (The Leftovers), Mary Elizabeth Winstead (10 Cloverfield Lane, Fargo) and Cristin Milioti (Black Mirror, How I Met Your Mother) have tested or read, sources say. Justina Machado, who stars in Netflix's One Day at a Time and who has appeared on Jane the Virgin and The Purge: Anarchy, tested for the role of Renee Montoya. Roberta Colindrez, who starred on the Amazon series I Love Dick and Starz's Vida, also tested for the character, a lesbian detective on the Gotham City police force.