Ok but there’s video of giraffes swimming

My husband told me that Hippos don't swim, but just float through the water, because they can stay under so long without breathing. But when they come to the top, they aren't swimming, but pushing themselves up from the bottom. Anyway, that's what the hippo zookeeper told him.

I think they move through the water using a stroke we used to call 'dog paddle'. Basically it's just floating and moving your legs(and arms for humans) as if you were walking.