Andean bear Bouba returns from the National Zoo in Washington, D.C., to reunite with his mate, Nicole; a king cobra is treated; Blanche, a feisty alpaca, is due to give birth at any moment.

The staff is hopeful for a successful breeding season when Mshango the giraffe meets the females of the herd. Power tools are needed for an Amur tiger's root canal, while Louie the swan falls ill, jeopardizing his release with his partner-in-crime.

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.

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

Surgery on a silverback gorilla's broken canine reveals a more serious medical issue. Is love in the air for two Birds of Paradise, Glory and Holiday? A confiscated black-breasted leaf turtle is introduced to eligible bachelorettes. And, dozens of venomous tarantulas keep the staff on their toes.

Zoo staff face unexpected setbacks weaning a bright sea lion pup off her mother's milk. The bird team steps in To support a rejected curassow chick. And, a squirrel monkey pays a visit to the dentist.

A markhor goat gives birth to Andre, the biggest baby of the year; a baby bat requires human care before it can be reintroduced to its colony; confiscated lizards destined for the pet trade require urgent medical attention.

Two adorable tiger cubs have outgrown their keepers and need to move to the adult exhibit. A silverback gorilla receives pioneering treatment to curb his worsening eyesight. And a passionate keeper plays matchmaker to a peculiar pair of birds.

A pregnant African wild dog has the staff anxiously preparing for the big day. Zoo director Jim Breheny steps in to help a keeper learn how to handle a golden eagle. And, a new tree in Jungle World gives the gibbons a new world to explore.

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 birth of a little blue penguin causes a sensation at the Bronx Zoo. The veterinary team scrambles to figure out what is wrong with Snowball, a beloved snow leopard. And the exhibits team designs a home for the newly arrived blue iguana.

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.

Beloved camel Max develops a large abscess on the top of his head; a marmot prepares for her first classroom visit as an ambassador animal; a peregrine falcon found at the base of skyscraper is brought to the zoo for a health check.

The future of the American Bison depends on a high-stakes race across the country. The reptile staff have their hands full with a diamond rattlesnake that needs to be medicated orally. And a pair of cheetahs are trained to walk the grounds.

The Zoo's huge male sea lion is in rut, and staff need to move the young males before he becomes territorial. The vet team come up with an ingenious solution to repair Dinky the Flamingo's broken ankle. And feeding a rock python proves challenging.

When keepers introduce two tigers as potential mates, the process proves bumpy. A pair of African porcupines arrive at the zoo, requiring delicate handling. And a pregnancy check on a 3,000 pound rhino necessitates some highly specialized equipment.

The brown bears keep tearing up their exhibit, leaving zoo staff scrambling for a solution. Armani the aardvark gets treated for a tooth infection which has dampened her enthuiasm for digging. And, a group of burrowing owls prepare to move.

A journey to eastern Africa is undertaken to return thousands of toads to the wild that were rescued from extinction. Also: A giraffe tries out a new piece of equipment; the avian department works to save the lives of millions of birds.

To help love bloom between two kiwis, zoo staff build an elaborate hut into which they introduce a pair of potential mates. When a King Cobra arrives at the zoo, keepers have their hands full training him to move from the exhibit to a holding pen.

A snow leopard named Leo that was rescued from Pakistan has trouble eating because of a broken tooth; the bird department works fast to restore a beehive; a fennec fox gets extra attention from the Ambassador Center staff.

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The last polar bear in New York City is showing his age so the staff makes sure he gets all the attention he needs. A trio of red ruffed lemurs are prepped for their big debut.

A 14-year-old otter is not its usual, energetic self; staff at the New York Aquarium move their sharks to a new exhibit; quirky capercaillies need help producing healthy chicks.

Crate training Nikita the Amur tiger in preparation for her move to Washington, D.C., proves challenging; an endangered Chinese alligator shows signs of being pregnant; staff prepare to release rare New England cottontail rabbits into the wild.