A hippo was wrongly “assigned” a male sex at customs (AMAC).
But zookeepers got suspicious as Gen-chan got older and they could not visually identify male reproductive organs.
According to the Mainichi newspaper, the zoo's vice director Kiyoshi Yasufuku said: "We recognise the importance of confirming the sex, and we want to ensure that such mistakes will not happen again."
Japanese zookeepers know the importance of recognising sex 🤣🤣
https://www.bbc.com/news/world-asia-68884548