Pigs may not fly, but hippopotamuses do — at least momentarily. When hippos get moving, all four feet leave the ground for about 15% of their stride cycles, researchers at Britain's Royal ...

Hippos aren't just lazy river-dwellers lounging around all day; they play a crucial role in their ecosystems. You'll find them spending much of their time submerged in rivers and lakes ...

Pygmy hippos, meanwhile, grow between 350 and 600 pounds and top out at no more than six feet in length, compared to the ...