Pink dolphins staying longer in Hong Kong waters, a sign of falling pollution levels during Covid-19

Rare pink dolphins are staying longer in Hong Kong waters, and possibly in greater numbers than before, thanks to reduced sea traffic and a more hospitable marine environment during the coronavirus pandemic, experts say.Native to the Pearl River Estuary and listed as a vulnerable species, their population in the area has been decreasing from about 2,500 in 2013 to about 2,000 last year, according to the conservation organisation WWF-Hong Kong.Recent data collected by the organisation has shown…

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