Gentoo penguins stroll inside an oceanarium in Changsha, capital of Central China's Hunan province, April 18, 2011. Four male and four female, the Gentoo penguins are helping to bring more tourists to the oceanarium and will be bred in the next two years. The largest of the penguins next to the two giant species, the Emperor Penguin and the King Penguin, Gentoo penguins can be easily recognized by the wide white stripe extending like a bonnet across the top of the head. [Photo/CFP]