Peka Sue was named after the "Topeka Zoo" when she arrived on May 6, 1966. She is larger and darker than her companion.

Submarie has been on loan from the Bronx Zoo since October 20, 1977. She is smaller and pinker than Peka Sue is.

Did you know that an adult hippo weighs up to four tons and can eat up to 150 pounds of grass and reeds a night? Their skin alone can weigh up to 1000 pounds.