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 ...

This video investigates why hippo waste poses an unusually deadly threat to river ecosystems. Scientists reveal how the sheer volume of their droppings quickly strips oxygen from the water. Footage ...

Add Yahoo as a preferred source to see more of our stories on Google. Pablo Escobar’s four escaped hippos have grown into a feral population of nearly 200 individuals in the Magdalena Basin of ...