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LaminatorX writes:

Back in his heyday as a cocaine kingpin, the late Pablo Escobar built a zoo on his palatial hacienda. According to a BBC report, the descendants of the four hippos he imported have not only survived, but are thriving in Colombia's drought-free climate.

From the article:

Here, conditions for hippos are idyllic. The river is slow moving and has plenty of shallows, perfect for larger animals which don't actually swim but push themselves off banks, gliding through the water. Moreover, the region never experiences drought, which tends to act as a natural brake on the size of herds in Africa.

How much the hippos like Colombia can be judged from how much sex they are having. In Africa they usually become sexually active between the ages of seven and nine for males, and nine and 11 for females, but Pablo Escobar's hippos are becoming sexually active as young as three. All the fertile females are reported to be giving birth to a calf every year.