The thunderous calls of common hippos can be heard from more than half a mile (1 kilometer) away — and when a hippo hears the booming call of an unfamiliar hippo, the animal often responds by letting ...

Hippos may look harmless, but their poop plays a deadly role in their ecosystem. This video explores how their waste can trigger dangerous chain reactions in rivers, affecting fish, other wildlife, ...

Hippos may appear inactive, but a recent study shows that they’re listening closely to their surroundings. Paul Souders via Getty Images Hippopotamuses are best known for their bumbling bodies, ...