Secrets of the Zoo

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, and a very grumpy tiger arrives at the Columbus Zoo. The zoo makes history by incubating rare turtle eggs.

An aging nanny goat fights for its life, and a pregnant rhino prepares to give birth.

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.

A chimpanzee is given a whole new lease on life under the care of the zoo vets, while a beaver has a gigantic tooth problem.

Iconic Australian animal arrivals make quite an impression with their unexpected screeching, and a rare mountain goat birth is observed.

The team teaches baby otters to swim before they make their television debut. A cougar’s future gets brighter with some expert eye care.

A monkey shows its true colors during a dental exam, and the team gives a huge female bison a physical.

Heidi Rose finds a mate, an Armadillo named Arthur gets his groove back, and a herd of Onagers are wrangled into the barn for their annual check-ups.

Super-cute Rinzen the Red Panda and a "Golden Girl" mandrill named Eebi come out on top. Plus we meet a sly Cheetah, and the Zoo’s own grumpy cat.