Pablo Escobar's 'cocaine hippos' show how invasive species can restore a lost world

Descendants of the drug lord's pets bear similarities to extinct megafauna

When the drug lord Pablo Escobar was shot dead in 1993, he left behind a zoo stocked with wild animals alongside his multibillion dollar cocaine empire. The lions, giraffes and other exotic species were moved from the luxurious Hacienda Nipoles estate east of Medellin to new homes, but nearly three decades later, dozens of hippos, descendants of animals left behind, are thriving in small lakes in northern Colombia, making them the world's largest invasive animal.

Now scientists say that contrary to the conventional wisdom that large invasive herbivore mammals have strictly negative effects on their new environments, Escobar's "cocaine" hippos show how introduced species can restore a lost world.