Hippos are surprisingly fast runners, reaching up to 50kp/h over short distances — quicker than the fastest human. They usually bear single calves that are born underwater, weighing up to 50kg. A ...

Although they spend most of their lives underwater, hippos do not swim in the traditional sense; instead, they move through water by pushing off the bottom and walking or bounding along riverbeds.

Since hippos spend as much as 16 hours a day in the water, baby hippos have adaptations for underwater nursing. They grip the nipple between their tongue and the roof of their mouth.

A family of hippos taking a serene nap underwater at the Cincinnati Zoo was captured in an adorable video taken in late January.

Discover how barbel fish clean hippos by eating parasites, dead skin, and algae in a fascinating case of mutualistic ...