From the series Ripples. What do you do if you run the zoo and your elephant gets sick? What will you feed the tiger in your zoo who would kill a deer for his dinner if he lived in the forest? What sort of home must you find to make a hippopotamus comfortable? Who should raise the baby tiger when its own mother cannot care for it? These and other questions about man's care of animals are explored on an unusual visit to the National Zoological Parkin Washington, D.C.