Pygmy hippo Mars didn’t listen to the zoo caretaker when play time in the pool was over, so his mom, Posie, had to step in.

This little pygmy hippopotamus has been giving the zookeepers a real run for their money with his baby hippo antics, ...

“Well, a boat doesn’t swim,” my colleague Molly Ball, pointed out. But hippos don’t have engines, or propellers, or sails. So how, exactly, do they charge through the water so impressively?

The Effect of Reduced Water Availability in the Great Ruaha River on the Vulnerable Common Hippopotamus in the Ruaha National Park, Tanzania. PLOS ONE, 2016; 11 (6): e0157145 DOI: 10.1371/journal ...

Hippopotamuses (Hippopotamus amphibius) are large, round, water-loving animals that are native to Africa. The word "hippopotamus" comes from the Greek word for "water horse" or "river horse ...

This is the amusing moment a hippo was spotted relaxing in the cool water. A zookeeper saw Xiangxiang submerged in the water during a deep afternoon nap at Shou Shan Zoo in Kaohsiung, Taiwan, on ...