Between 2011 and 2019, four males were castrated and two females were sterilised, but this did little to slow the hippos' progress.

Source: https://www.9news.com.au/world/pablo-escobars-cocaine-hippos-face-colombian-government-cull/977e6d35-58d5-47c2-94e6-52a1f98f2e0e

Here you’ll fall asleep to the sound of hippos splashing in the river outside your tent and see fresh tracks of wandering Thompson gazelles on your way to breakfast each morning.

Source: https://www.forbes.com/sites/liviahengel/2023/06/26/this-might-be-the-most-sustainable-safari-camp-in-the-masai-mara/

In 2021, scientists recommended culling the hippos to prevent long-term negative effects, but other scientists are calling instead for a castration program, citing concerns over animal welfare.

Source: https://www.9news.com.au/world/pablo-escobars-cocaine-hippos-face-colombian-government-cull/977e6d35-58d5-47c2-94e6-52a1f98f2e0e

Our open-air vehicle bounced over rough dirt and soft sand roads to get close-up views of elephants, zebras, giraffes, lions, wildebeest, hippos, and many more animals in the bush.

Source: https://wvmetronews.com/2023/09/06/the-reluctant-traveler/