Dave, a kangaroo suffering from chronic arthritis, tries cryotherapy. A large group of rambunctious gharials are trained to patiently wait for their food. And, a tiny pygmy marmoset gives birth to an even tinier baby.

A tomistoma, a freshwater crocodilian, stops laying eggs and a team of keepers scrambles to treat her. The veterinary team has to rescue a baby antelope that isn't getting the care it needs from its mother. And Mert the Goose takes a field trip.

The zoo's conservation work with American bison involves an embryo transfer program between two herds thousands of miles apart. Meanwhile, a diamondback rattlesnake fighting an infection requires oral medication; and the Ambassador Center staff trains two cheetahs to stroll comfortably among humans on the grounds.

An in-depth behind the scenes look at the animals of the Bronx Zoo.

An in-depth behind the scenes look at the animals of the Bronx Zoo.

An in-depth behind the scenes look at the animals of the Bronx Zoo.

An in-depth behind the scenes look at the animals of the Bronx Zoo.

The ingenuity of zoo staff is put to the test as they devise a treatment for a newborn snow leopard cub struggling to walk. A group of surprisingly adorable Rodrigues fruit bats are trained for a big move.

The squirrel monkeys play hard-to-get with the Children's Zoo's keepers. A pair of Komodo dragons meet for the first time, with explosive results. And the Inca terns prepare for their first big flight.