Hippos are able to hold their breath for a very long time to stay underwater. They can even sleep underwater, as a reflex kicks in when it's time to come to the surface to breathe. They do this without waking up. Hippos, despite the aforementioned, are unable to swim. They are incapable of even floating. They bounce off the bottoms of rivers, pools, and other bodies of water, pushing forward with their feet - they literally walk on the water's surface.

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Hippos are graceful in water, good swimmers, and can hold their breath underwater for up to five minutes. However, they are often large enough to simply walk or stand on the lake floor, or lie in the shallows. 

Hippopotamuses may look like peaceful hunkers, but they're actually extremely dangerous. The female becomes fierce when her young is threatened.

The Egyptians of antiquity knew this well: they had deified her under the name of Taouret (Touéris); she presided over deliveries and breast-feeding. The male was one of the personifications of Seth, the god of chaos.

Crocodiles know this perfectly well, and they usually leave them alone.

YouTube is full of videos of crocs being rolled by hippos… 

And why not. Unlike most herbivores, with a mouth measuring up to 1.2 meters and canines that can reach 50 cm, hippos are more than equipped to play the role of predator from time to time. In fact, in a recent paper published by biologist Joseph Doudley, he and his researchers observed carnivorous behavior in hippopotamus populations [2][3]. Doudley lists instances where wild hippos have killed and fed on some of Africa's largest animals, including: Elephants, Wildebeest, Kudus and sometimes even other hippos while in zoos there have been reports of hippos killing and eating their neighbors. As to why hippos sometimes crave to increase their diet and are in the mood to eat meat from their regular grass menu, it's unclear why. Cases of hippos becoming carnivores have been observed: during periods of drought, when food is scarce (needs must be met); during times of plenty, especially when the meat literally presents itself to the hippos (such as during drownings when masses of wildebeest cross rivers) or sometimes by stealing products killed by other predators that the hippos think they can get rid of (which probably includes almost all predators, since the hippopotamus is the third largest mammal in the world). There it's done. Hippos are herbivores, not omnivores...but try telling them that.

Hippopotamuses may look like peaceful hunkers, but they're actually extremely dangerous. The female becomes fierce when her young are threatened.

The Egyptians of antiquity knew this well: they had deified her under the name of Taouret (Touéris); she presided over deliveries and breastfeeding. The male was one of the personifications of Seth, the god of chaos.

Crocodiles know this perfectly well, and they usually leave them alone.