I think they serve an important ecological function of pushing down marsh grass to better the flow of water. Or something like that.
Wait, that's just 2.25 kg of dung per hippo. That sounds like way too little. I'm pretty sure a human being could produce 2.25 kg of dung in a day with the right team spirit and some elbow grease, but you're telling me these dainty, bashful cowards can't do better despite weighing so much more? Pathetic.
But I bet their poop is great for growing the grasses they eat. It’s probably also really good for tourists, who it seems to attract and that they also eat.
For a second I thought that 9 ton amount was for a single hippo and was shocked.
What a bunch of lazy assholes. They could just as easily walk up on land and poop there. Do they like to stew in their own feces?
AFAIK they purposefully poop in the water to hide there. So yes, they "like" it.