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In this photo provided by the Cincinnati Zoo & Botanical Garden, Bibi, a 23-year-old hippopotamus, stands by her new baby, born Wednesday, Aug. 3, 2022. The staff at the zoo discovered the calf's mother was pregnant around April Fool's Day. It came as a surprise because she was on birth control. (Cincinnati Zoo & Botanical Garden via AP)

In this photo provided by the Cincinnati Zoo & Botanical Garden, Bibi, a 23-year-old hippopotamus, stands by her new baby, born Wednesday, Aug. 3, 2022. The staff at the zoo discovered the calf's mother was pregnant around April Fool's Day. It came as a surprise because she was on birth control. (Cincinnati Zoo & Botanical Garden via AP)

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