Floating on a river boat near a Liberian island, vet Richard Ssuna watches intently as animal carers wade towards the shore hurling fruits and imitating chimpanzee calls as they go.
The beach is empty, but the sound of rustling and chimpish grunts begins to fill the green undergrowth. Slowly, an ape knucklewalks out onto the beach to grab some food.
He's a high-ranking member of his troop, explains Ssuna, as more chimpanzees follow. The younger ones gambol and hoot in delight as carers throw them bananas, palm nuts and cassava.
Sixty-five chimps are spread across six uninhabited river islands near the Atlantic Ocean, about 55 kilometres (34 miles) south of the West African country's capital Monrovia.