A red-shanked douc langur baby is seen at the Singapore Zoo on Feb. 18, 2020. The animals under the care of the Wildlife Reserves Singapore (WRS) gave birth to over 660 babies and hatchlings representing 121 species in 2019. (Photo by Then Chih Wey/Xinhua)

A white rhinoceros calf is seen at the Singapore Zoo on Feb. 18, 2020. The animals under the care of the Wildlife Reserves Singapore (WRS) gave birth to over 660 babies and hatchlings representing 121 species in 2019. (Photo by Then Chih Wey/Xinhua)

A crocodile monitor hatchling is seen at the Singapore Zoo on Feb. 18, 2020. The animals under the care of the Wildlife Reserves Singapore (WRS) gave birth to over 660 babies and hatchlings representing 121 species in 2019. (Photo by Then Chih Wey/Xinhua)

A red-shanked douc langur baby is seen at the Singapore Zoo on Feb. 18, 2020. The animals under the care of the Wildlife Reserves Singapore (WRS) gave birth to over 660 babies and hatchlings representing 121 species in 2019. (Photo by Then Chih Wey/Xinhua)