In this photo provided by the Oklahoma City Zoo, three Sumatran tiger cubs are pictured with Amur tiger cub Zoya, second from left, on a scale, Saturday, July 23, 2017. Zoya, who was being hand-raised at the Philadelphia Zoo, was transferred to Oklahoma City in an attempt to cross-foster Zoya with the Oklahoma City Zoo's Sumatran tiger Lola and her three cubs, who were born one day before Zoya. (Gretchen Cole, Oklahoma City Zoo, via AP).
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