Zeus And Hippopotamus
At the Creation Time hippos wanted to be as sleek as horses. The Chief God made them as elegant creatures as mustangs. Hippos were content for a time. Watching some elephants performing tricks they went to Zeus asking a favor. Hippos got a tremendous boost in girth but they became too stupid I guess in the process. Naturally they complained. Zeus had such a hard time trying to adjust their speed( which they had acquired being horse-like), and with their newly acquired ponderous gait. In the end the Chief God gave up. He said in exasperation,” You are impossible on land. Go jump into some lake!”
Since then hippos became adept in water.