Secrets of the Zoo Season 3

A 44-year-old orangutan has the biggest birthday bash of the year at the zoo.

An Asian takin calf hangs on for dear life; a very grump tiger arrives at the zoo.

An ornery ostrich refuses to get its shots; a pregnant rhino prepares to give birth; a beloved nanny goat fights for its life.

Staff members have their hands full with an adorable koala that’s losing weight, and a routine exam on a beloved lemur takes an unexpected turn.

Rory the duck, Krypto the Onager, and Unga the Bonobo are given a whole new lease on life, and Zucchini the Beaver has a gigantic tooth problem.

Iconic Australian animals make an entrance, a rare mountain goat birth is recorded, and a near extinct species of deer take keepers for a swim.

Staff members at Columbus Zoo and The Wilds are counting down the days until spring.

A monkey shows its true colors; a gigantic female bison gets a checkup.

A herd of donkeys is wrangled into the barn for its annual checkup.

Two of the zoo's cats receive some high-tech assistance in the baby-making department.