Yangtze alligators are seen outside its living area in Xuancheng, East China's Anhui province, March 19, 2017. After over four months of dormant period, more than 13,000 Yangtze alligators in Xuancheng Yangtze alligator national conservation area began to be transfered to the outdoor in order to make them enjoy the warm sunshine of spring. [Photo/Xinhua]

"Chinese alligators hibernate in the winter. We usually move them out of houses in March when the temperature is above 16 Celsius degrees," said workers at Anhui Yangtze Alligator Reserve in Xuancheng city.

Wild Chinese alligators often go through the hibernation in a cave in winter, while alligators bred in captivity spend the period indoors.

Every Chinese alligator needs to do physical examination and only healthy and strong ones are allowed to get outside, the reserve said.

"The alligators are still in the semi-dormancy period and can not eat or drink right after they were move out. They live on their saved energy," said workers at the reserve. "They will not start to eat until April when the temperature rises above 25 Celsius degrees. We will feed them some mussels and snails to practice their hunting skills."

Anhui Yangtze Alligator Reserve is the only artificial breeding base for Chinese alligators worldwide. It has 13,000 captive alligators.

To increase the number of wild alligators, the reserve has released batches of the reptiles to their natural habitat since 2003.

Research shows they have generally adapted well and have begun to reproduce. There are about 130 to 150 in the wild.

China listed the Chinese alligator as a first-class protected animal in 1972.