A sea lion kisses its baby at the Harbin Polarland in Harbin, northeast China's Heilongjiang Province, June 20, 2020. In recent days, a sea lion gave birth to a baby sea lion, which has been in good condition, at the Harbin Polarland in Harbin. (Xinhua/Wang Jianwei)

A sea lion kisses its baby at the Harbin Polarland in Harbin, northeast China's Heilongjiang Province, June 20, 2020. In recent days, a sea lion gave birth to a baby sea lion, which has been in good condition, at the Harbin Polarland in Harbin. (Xinhua/Wang Jianwei)

A sea lion kisses its baby at the Harbin Polarland in Harbin, northeast China's Heilongjiang Province, June 20, 2020. In recent days, a sea lion gave birth to a baby sea lion, which has been in good condition, at the Harbin Polarland in Harbin. (Xinhua/Wang Jianwei)

A baby sea lion rests at the Harbin Polarland in Harbin, northeast China's Heilongjiang Province, June 20, 2020. In recent days, a sea lion gave birth to a baby sea lion, which has been in good condition, at the Harbin Polarland in Harbin. (Xinhua/Wang Jianwei)

A baby sea lion rests at the Harbin Polarland in Harbin, northeast China's Heilongjiang Province, June 20, 2020. In recent days, a sea lion gave birth to a baby sea lion, which has been in good condition, at the Harbin Polarland in Harbin. (Xinhua/Wang Jianwei)

A baby sea lion rests at the Harbin Polarland in Harbin, northeast China's Heilongjiang Province, June 20, 2020. In recent days, a sea lion gave birth to a baby sea lion, which has been in good condition, at the Harbin Polarland in Harbin. (Xinhua/Wang Jianwei)