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

When keepers introduce two tigers as potential mates, the process proves bumpy; a pair of African porcupines arrive at the zoo, requiring delicate handling; 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 enthusiasm for digging; a group of burrowing owls prepare to move.

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; Monty the adorable otter needs to visit the dentist.

The slow loris has a tiny window for breeding, so staff anxiously help a potential pair connect; the veterinary team develop ground-breaking techniques to treat the stoic pigeons; an okapi with a limp gets a helping hand.

The last polar bear in New York City shows his age so staff make sure he gets the attention he needs; a trio of red ruffed lemurs prepare for their big debut; a new exhibit is constructed for the hellbender, a giant amphibian with a bad reputation.