HONG KONG (WLS) -- Hong Kong's iconic pink dolphins are in danger of extinction.The Chinese white dolphins are famous for their pink coloring, but now, experts say their populations are decreasing due to a shrinking habitat.In the waters off of Hong Kong, their numbers have declined to 62, compared to 158 back in 2003.Experts cite five main factors for the declining dolphin population: coastal development, water pollution, underwater noise pollution, vessel collision and overfishing.