A baby emperor penguin peeks out of the pouch of its father at Chimelong Ocean Kingdom in Zhuhai, South China's Guangdong province. [Photo provided to chinadaily.com.cn]

Two emperor penguins were hatched at Chimelong Ocean Kingdom this month in Zhuhai, South China's Guangdong province. This is the second successful incubation at the park, where two baby emperor penguins broke out of their shells in August 2016. The female emperor penguin lays one egg each time and transfers it to the male to hatch and incubate it. The two eggs hatched on June 2 and 17, respectively. It takes 66 days for the first egg to hatch and 66 hours for the little chick to come out of the shell. The breeding of emperor penguins has always been a challenge worldwide, as eggs laid by females may not necessarily be fertilized.