Colombia has a population of about 100 "cocaine hippos" founded from a group of one male and three females, which escaped from a drug kingpin's private zoo; it's even estimated that this population could grow to over 1,000 in the next two decades or so:
The rise of the so-called "cocaine hippos" began in 1993 after authorities killed Pablo Escobar and seized his luxury estate Hacienda Napoles, about 250km (155 miles) north-west of the capital Bogotá.
Animals found there were distributed to zoos across the country, but not the hippos. "It was logistically difficult to move them around, so the authorities just left them there, probably thinking the animals would die," Ms Castelblanco said.
Instead, they thrived.
Over the years, scientists have tried to calculate how many hippos are living in Colombia's waterways, with estimates ranging from 80 to 120 animals. "It is the biggest hippo herd outside Africa, which is their native region," veterinarian and conservationist Carlos Valderrama told the BBC. [...]
Ms Castelblanco and her peers say the population will reach over 1,400 specimens as early as 2034 without a cull - all of them descended from the original group of a male and three females.
I'm curious however if these "cocaine hippos" don't show any signs of inbreeding depression given how small the founding group was. Are there any studies/articles on this aspect in that Colombian hippo population?