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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Every day, thousands of hippos come to Kenya's Mara River. But they aren't there just to cool down — they also come to poop. As the hippos wallow, they collectively expel considerable quantities of ...

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 ...

When not grazing on land, hippos like to keep cool by gathering in packed pools for up to 16 hours a day, and it takes more than some shifting bowels for them to leave again. The semi-aquatic ...

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 ...