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Hippopotamuses (the anomalous plural hippopotami is sometimes used � the correct Greek plural hippopotamodes is never used in English; hippos can be used as a short plural), are gregarious, living in groups of up to 40 animals; such a group is called a pod, herd, dale, or bloat. A male hippopotamus is known as a bull, a female as a cow, and a baby as a calf. They are also known as the Common Hippopotamus or the Nile Hippopotamus.