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Fiona is a big sister. The baby hippo born to Bibi at the Cincinnati Zoo last week is a boy. The zoo has announced it was able to confirm the gender of Fiona's sibling. Zoo officials say they're just happy the calf is healthy. The hippo has not yet been named. As you might recall, apparently the pregnancy was a surprise to zookeepers. As for meeting his sister, keepers say that the sibs have seen each other from a distance, but that “it’s a process.”