A pair of Chinese Indo-Pacific humpback dolphins, a rare variety of whale included on the national list of key protected wild animals, frolic in the ocean off the coast of Nanwan village in Ningde's Xiapu county, East China's Fujian province on March 1. [Photo/VCG]

A pair of Chinese Indo-Pacific humpback dolphins, a rare variety of whale included on the national list of key protected wild animals, frolic in the ocean off the coast of Nanwan village in Ningde's Xiapu county, East China's Fujian province on March 1. [Photo/VCG]

A pair of Chinese Indo-Pacific humpback dolphins, a rare variety of whale included on the national list of key protected wild animals, frolic in the ocean off the coast of Nanwan village in Ningde's Xiapu county, East China's Fujian province on March 1. [Photo/VCG]

A pair of Chinese Indo-Pacific humpback dolphins, a rare variety of whale included on the national list of key protected wild animals, frolic in the ocean off the coast of Nanwan village in Ningde's Xiapu county, East China's Fujian province on March 1. [Photo/VCG]