Birds of Prey (And the Fantabulous Emancipation of One Harley Quinn) star Margot Robbie said an actual hyena was once considered for the role of Harley's pet, Bruce. However, the animal proved much too difficult to work with.

"We went to go see a real-live hyena," Robbie told ComicBook.com. "There’s a hyena in California that’s appeared on-screen before. It turns out it was going to be impossible to shoot with him because they’re extremely dangerous and take ownership of anything they touch. So, if you put him on a couch, he’s gonna eat the couch."

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According to Robbie, they ended up using a large dog, and CGI was then used to make the it look more like a hyena. "Because the alternative is to have a dude in a green suit," she added. "That’s often weird."

Tickets for Birds of Prey are currently on sale, and those with DC Universe subscriptions can even purchase tickets for advanced screenings in select U.S. cities.

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Directed by Cathy Yan from a script by Christina Hodson, Birds of Prey (And the Fantabulous Emancipation of One Harley Quinn) stars Margot Robbie, Jurnee Smollett-Bell, Mary Elizabeth Winstead, Rosie Perez, Ewan McGregor, Ella Jay Basco, Steven Williams, Derek Wilson, Dana Lee, Francois Chau, Charlene Amoia, Chris Messina and Matthew Willig. The film opens Feb. 7.