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"There's no way we could take just one," Calcagno said. "They're gorgeous. Even when they're sleeping they're gorgeous. And we thought their story was an important one for us to tell."
The zoo said the 6-year-old tigers, named Molly, Milou, Ginger and Grace, will go on display alongside the zoo's 12-year-old female tiger, Torako, at the facility Thursday.