HKdolphinwatching粉紅海豚

「印度太平洋駝背海豚」，又稱「中華白海豚」繁殖及棲息於珠江三角洲河口，介乎香港及澳門一帶，而只有東面的群種才有顯著的白或粉紅的顏色。

Why are the dolphins pink?
The best theory we've heard is that they're actually white, but they look pink because they're blushing. All cetaceans are warm-blooded, meaning they regulate their own body temperatures. When they create excess heat from exercise, such as chasing fish, they flush blood to the outer layers of their skin, to get the heat from their body core out beyond the insulating layer of blubber, so that the heat can disperse to the water. This "blushing" makes them look pink.
I will go Hong Kong on 7th Dec and plan to join dolphin watching tour on 11th of Dec 2007. Will share more detail about tour after I come back from the tour.
Cheers.