Describes the lives of the baby hippopotamus named Owen and a one-hundred-thirty year old tortoise named Mzee, and how they came became friends after Owen was rescued from the 2004 tsunami in Kenya, and was placed in Mzee's enclosure in Haller Park.
A bored hippopotamus cheers up after blowing mud fountains with Aunty, stretching for leaves with Giraffe, playing games with Monkey, and jumping into a cool lake with Mommy and Daddy.
Despite the intrigue of their new riverbank home, the new hippos are not accepted by the others because of their unusual habits, but their sudden disappearance causes a stir in their neighborhood.