Usually, dumping fish-killing garbage into rivers is a human’s job. But hippos seem to be doing it, too, through their routine mass pooping events. At least, that’s what a team of scientists in the ...

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Hippos may look lazy in the water, but their poop creates one of the deadliest natural threats in their environment. By releasing massive amounts of waste into rivers, they deplete oxygen levels and ...

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, ...

Hippopotamuses play a crucial role in East Africa’s ecosystem, ingesting copious amounts of silica-laden grass and excreting 880 pounds of the nutrient into Kenya’s Mara River every day. In turn, this ...

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 ...