Pablo Escobar's 'cocaine hippos' may be helping river ecosystems in Colombia

Hippos that were brought to Colombia decades ago by Pablo Escobar, the notorious cocaine kingpin, are now thriving in the country's river ecosystems. Scientists even suspect that river habitats may benefit from the presence of these non-native hippos, with the large herbivores filling an ecological niche that has been vacant in the region for thousands of years.

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