Three cygnets wade in the Eco Lake at Singapore Botanic Garden in Singapore, on Feb. 4, 2020. A pair of black swans, kept by the Singapore Botanic Garden, successfully hatched 3 cygnets on Feb. 1 from a clutch of 4 eggs that were laid in late December 2019. (Photos: Xinhua)

Three cygnets are seen at the Eco Lake at Singapore Botanic Garden in Singapore, on Feb. 3, 2020. A pair of black swans, kept by the Singapore Botanic Garden, successfully hatched 3 cygnets on Feb. 1 from a clutch of 4 eggs that were laid in late December 2019.

A family of black swans with 3 cygnets wade in the Eco Lake at Singapore Botanic Garden in Singapore, on Feb. 4, 2020. A pair of black swans, kept by the Singapore Botanic Garden, successfully hatched 3 cygnets on Feb. 1 from a clutch of 4 eggs that were laid in late December 2019.

A family of black swans with 3 cygnets wade in the Eco Lake at Singapore Botanic Garden in Singapore, on Feb. 4, 2020. A pair of black swans, kept by the Singapore Botanic Garden, successfully hatched 3 cygnets on Feb. 1 from a clutch of 4 eggs that were laid in late December 2019.

Three cygnets wade in the Eco Lake at Singapore Botanic Garden in Singapore, on Feb. 4, 2020. A pair of black swans, kept by the Singapore Botanic Garden, successfully hatched 3 cygnets on Feb. 1 from a clutch of 4 eggs that were laid in late December 2019.

A cygnet stays close to its mother near the Eco Lake at Singapore Botanic Garden in Singapore, on Feb. 3, 2020. A pair of black swans, kept by the Singapore Botanic Garden, successfully hatched 3 cygnets on Feb. 1 from a clutch of 4 eggs that were laid in late December 2019.

A cygnet wanders about in the Eco Lake at Singapore Botanic Garden in Singapore, on Feb. 4, 2020. A pair of black swans, kept by the Singapore Botanic Garden, successfully hatched 3 cygnets on Feb. 1 from a clutch of 4 eggs that were laid in late December 2019.

Three cygnets wade in the Eco Lake at Singapore Botanic Garden in Singapore, on Feb. 4, 2020. A pair of black swans, kept by the Singapore Botanic Garden, successfully hatched 3 cygnets on Feb. 1 from a clutch of 4 eggs that were laid in late December 2019.