A hippopotamus that was believed to be male for seven years has been confirmed to be female by DNA testing. The 12-year-old hippo, named Gen-chan, arrived at the Osaka Tennoji Zoo in Japan in 2017 and was initially identified as male based on customs documents. However, zookeepers noticed that Gen-chan lacked typical male hippo behaviors and could not visually identify any male genitalia, prompting them to request DNA analysis. The zoo announced the results last week and stated that they will continue to provide a comfortable environment for Gen-chan.