Hippos respond differently to the calls of familiar and unfamiliar hippos. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

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, ...

Hippos might seem harmless from a distance, but their poop plays a surprisingly dangerous role in river ecosystems. Here's how this natural waste can choke out fish, alter water quality, and even ...