Thread by @BBCWorld

Off the coast of Hong Kong beneath the murky waters, you’ll find pink dolphins

But could they soon disappear?

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Back in the 1990s officials counted around 250 of the animals

Now, there’s just 32 left

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They’re a protected species in both Hong Kong and China

They’re incredibly rare – but not actually pink

Warm blood close to the skin’s surface gives them a bubblegum pink appearance

But, they could soon disappear from the coastline forever

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Taison Chang, chairman of the Hong Kong Dolphin Conservation Society, says the remaining dolphins face four main threats

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Marine traffic can be particularly devastating

Hong Kong is one of the busiest ports in the world

Their habitat is crisscrossed 24 hours a day with thousands of boats

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In 2015, one dolphin, known as WL212, was found with cuts so deep that its tail was almost severed

It’s thought the young six-year-old male was hit by the blades of a boat turbine

Conservationists fought to save him

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Threats to pink dolphins are increasing, conservationists claim

"We are at a crossroads,” says Taison Chang: “This battle is hard to fight, and it’s a long one, but we have to carry on”

Find out more about the dolphins and the people trying to save them: bbc.in/HKPinkDolphins