Pablo Escobar's hippos

We didn't make it to Medellín on this trip to Colombia, but in reading through our guidebook, we discovered that some distance outside of Medellín, drug lord Pablo Escobar had his private ranch, Hacienda Napoles, where he had, among other things, a menagerie of exotic animals, including hippos. After Pablo Escobar's downfall, the other animals were taken to zoos, but the hippos had managed to elude capture... and established themselves in Colombia's Magdalena River (and other watery locations...