The hippopotamus (hippopotamos, hippos meaning horse and potamos meaning river), is a large, mostly plant-eating African mammal.

Hippopotamus also sometimes called hippos, are gregarious, living in groups of up to 40 animals, called a pod, herd, school or bloat.

A male hippopotamus is known as bull, a female as cow, and a baby as calf. A hippos lifespan is typically 40 to 50 years. Female hippos reach sexual maturity at 5 to 6 years and have a gestation period of 8 months.

Donna the Hippo, 55, is the oldest known hippo in captivity. She lives at the Mesker Park Zoo in Evansville, Indiana.

Hippos average 3.5 meters (11 ft) long, 1.5 meters (5 ft) tall at the shoulder, and weigh from 1, 500 to 3, 200 kilograms (3, 300 to 7, 000 lb).

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