Four decades ago, Pablo Escobar brought to his Medellín hideaway four hippopotamuses, the centerpieces of a menagerie that included llamas, cheetahs, lions, tigers, ostriches and other exotic fauna. After Colombian police shot Escobar dead in December 1993, veterinarians removed the animals—except the hippos, which were deemed too dangerous to approach. The hippos fled to the nearby Magdalena River and multiplied.  Today, the descendants of Escobar’s hippos are believed to number nearly 200. Their uncontrolled growth threatens the region’s fragile waterways. Smithsonian contributor Joshua Hammer joins us to recount this strange history and explain why Colombian conservationists have embarked upon an unusual program to sterilize these hippos in the wild via “invasive surgical castration,” a procedure that is, as he has written (https://www.smithsonianmag.com/science-nature/pablo-escobar-abandoned-hippos-wreaking-havoc-colombian-jungle-180984494/) for Smithsonian magazine, “medically complicated, expensive and sometimes dangerous for hippos as well as for the people performing it.” Then, ecologist Rebecca Lewison tells us how her long-term study of hippo populations in Africa offers hints of how these creatures will continue to alter the Colombian ecosystem—and what authorities can do about it. Let us know what you think of our show, and how we can make it better, by completing our There's More to That listener survey here (https://docs.google.com/forms/d/e/1FAIpQLSfS90zjBZ2oGa9JxVa-R5affKcOHaR2-ib1_KZeWm3HDQXJIA/viewform) . Read Josh Hammer's Smithsonian story about Escobar's hippos and their descendants here (https://www.smithsonianmag.com/science-nature/pablo-escobar-abandoned-hippos-wreaking-havoc-colombian-jungle-180984494/) . Learn more about Rebecca Lewison and her work here (https://cmi.sdsu.edu/rebecca-lewison/) . Find prior episodes of our show here (https://www.smithsonianmag.com/podcast/) . There’s More to That is a production of Smithsonian magazine and PRX Productions. From the magazine, our team is Chris Klimek, Debra Rosenberg and Brian Wolly. From PRX, our team is Jessica Miller, Adriana Rosas Rivera, Genevieve Sponsler, Rye Dorsey, and Edwin Ochoa. The Executive Producer of PRX Productions is Jocelyn Gonzales. Fact-checking by Stephanie Abramson. Episode artwork by Emily Lankiewicz  Music by APM Music.

Pablo Escobar’s legacy of mayhem continues by way of a thriving population of giant African mammals.

Scientists published the first assessment of the impact that invasive hippos imported by drug lord Pablo Escobar are having on Colombian aquatic ecosystems. The hippos are changing the area's water quality by importing large amounts of nutrients and organic material from the surrounding landscape.

Hippo and Crocodile CruiseToday the VESA group got the opportunity to enjoy a hippo and crocodile cruise along Lake St. Lucia. St. Lucia estuary park is home to around 1200 Nile Crocodiles and 800 hippopotamus. I find hippos intimidating as the

Composting toilets have a lot of benefits. But can they really help save hippos?

Hippos are tough animals with tough hides. So tough that there's a species of leech that has evolved to live and feed in the only part of the hippo where the sun don't shine. Ladies and gentlemen, the life and times of the hippo butt leech.

David Grimm and Meghna Sachdev discuss robots that can induce ghostly feelings, the domestication of cats, and training humans to echolocate. Elizabeth Pennisi discusses overcoming hippos' dangerous reputation and oddly shaped bodies to study their important role in African ecosystems. Hosted by Sarah Crespi. [Img: Kabacchi/Wikipedia]