The Zoo

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

It's a rough start as the keepers introduce two tigers as potential mates. Then a pair of porcupines arriving at the zoo require delicate handling, and a pregnancy check on a 3,000-pound rhino demands highly specialized equipment.

As the brown bears keep tearing up their exhibit, the staff scrambles for a solution. Then an aardvark is treated for a tooth infection that has dampened her enthusiasm for digging, and a group of burrowing owls prepares to move.

Trust and experience are put to the test when an elephant requires delicate veterinary treatment from her keepers. Then, endangered pink pigeons need all the help they can get to produce offspring, and an adorable otter needs to visit the dentist.

The slow loris has a tiny window for breeding, so the staff anxiously helps a potential pair connect. Then the vet team develops ground-breaking techniques to treat the stoic penguins, and an okapi with a limp gets a helping hand.

An polar bear is showing his age, so the staff makes sure he gets all the attention he needs. Then three red ruffed lemurs prepare for their big debut, and a new exhibit is constructed for the hellbender salamander.

A pregnant African wild dog has the staff anxiously preparing for the big day, while the zoo director helps a keeper to learn how to handle a golden eagle. Then a new tree gives the gibbons a fresh world to explore.

The ingenuity of the staff is put to the test as they devise a treatment for a snow leopard cub struggling to walk. Then a group of fruit bats are trained for a big move, and the gazelles get a new exhibit space near the zebras.

The squirrel monkeys play hard-to-get with the keepers, then a pair of Komodo dragons meet for the first time with explosive results. Meanwhile, the Inca terns prepare for their first big flight.

Surgery on a gorilla's broken tooth reveals a serious medical issue. Then, love may be in the air for two birds of paradise, and a turtle is introduced to eligible mates. Meanwhile, the tarantulas keep the staff on their toes.