Pink dolphin sightings these days are unusual enough to begin with – and it is unheard of to see so many in one place at the same time. According to the Hong Kong Dolphin Conservation Society, the number of pink dolphins in Hong Kong waters plummeted from 158 in 2003 to 61 in 2014 – a 40% decline. Other small populations of Chinese white dolphins – some with a slight pink tint, others appearing grey – found near river mouths in Thailand, Vietnam and Malaysia, are also threatened.