A Chinese White Dolphin calf was born before the eyes of dolphin lovers during a boat trip in mid-September, the first such sighting since scientists started studying the endangered species eight years ago. Sunny, whose sex is not known, was born at 11.30am near Sha Chau in north Lantau on September 16. In contrast to his mother's pink complexion, the calf was dark grey and had a floppy dorsal fin. He dived in and out of the water with the help of other dolphins after the birth and disappeared from sight minutes later. 'We all watched and wondered what four dolphins in front of us were doing as they circled a fifth dolphin which appeared to struggling just below the surface,' said Dr Lindsay Porter, the dolphin conservation officer for the World Wide Fund for Nature Hong Kong. 'Suddenly, one of the dolphins pushed the slippery newborn dolphin to the surface and it puffed its first breath.' Sunny has only a 20 per cent chance of survival because of Hong Kong's polluted waters, experts say. Dr Porter said seeing the birth had scientific significance in helping to understand the species. The experts discovered that other dolphins played a key role in helping the mother and offspring.