Bossou spotted the three-day-old ducks in a nest on the edge of Chimp Island in the zoo. He rescued them from the water and cradled them until zoo authorities became aware of what was going on.
He then handed them over in return for some bananas.
The ducklings have now set up home in the DSCPA shelter. Spokesperson Miriam Kerins said the story was very unusual.
"This large chimpanzee, who was a male, cradled the ducklings, looked after them and minded them, thinking they were in danger…I think it's so touching," she said.