S4 E1 • Episode 1

S4 E2 • Episode 2

S4 E3 • Episode 3

S4 E4 • Episode 4

S4 E5 • Episode 5

S4 E6 • Episode 6

S4 E7 • Episode 7

S4 E8 • Episode 8

S4 E9 • Episode 9

S4 E10 • Episode 10

S4 E11 • Episode 11

S4 E12 • Episode 12

S4 E13 • Episode 13

S4 E14 • Episode 14

S4 E15 • Episode 15

S4 E16 • Episode 16

S4 E17 • Episode 17

Vet Mike tailors a designer jacket for capuchin Bruce, baby Tia-Nang tries to prove to her mother she is a grown-up, and Marina from the sister sanctuary in Vietnam checks on the progress of the golden-cheeked gibbons.

S4 E18 • Episode 18

Alison Cronin goes undercover to save a chimp forced to work as a photographer's prop in Turkey, and turns to her Dorset MP for help.

S4 E19 • Episode 19

The world's oldest woolly monkey Xuzie is diagnosed with depression, while concerns remain over Trudy the chimp. At the orang-utan enclosure, there is great excitement over Hsiao-Quai's early delivery.

S4 E20 • Episode 20

Staff grow anxious when orang-utan Hsiao-quai refuses to bring her newborn baby indoors during a storm. Ailing chimp Trudy's condition starts to improve when she begins a strict new diet and 38-year-old Xuzie, the world's oldest woolly monkey, gets a treat of giant locusts to help build up her strength.