Alpha male Hananya shows his dislike for needles, while the other chimps have a banana-fishing expedition. Alison and Jeremy Keeling rehouse two capuchin monkeys in Hertfordshire, and there is an exciting development among the endangered gibbons.

The team must make an important decision concerning the safety of a chimp group when alpha male Hananya continues to exhibit violent behaviour. Elsewhere, chimps Simon and Eveline compete in a swing-off, dental surgery is carried out and the park's staff prepare for the next woolly monkey birth.