CBS drama which aired from 1966 to 1969. Marshall Thompson starred as Dr. Marsh Tracy, a veterinarian running an animal study center in Africa. Cheryl Miller, Hari Rhodes, Yale Summers, and Ross Hagen co-starred. A young Erin Moran joined the show's cast during its fourth and final season on the air. Mention should be made of Judy the Chimp and Clarence the Cross-Eyed Lion, two animal members of the cast who were arguably more popular with viewers than their human thespian counterparts.