A ring-tailed lemur climbs up next to the radiator to keep warm at Beijing Zoo on January 11, 2019. Staff in Beijing Zoo uses various methods to keep animals warm during the cold winter days depending on their different habitats.

An elephant tortoise takes a “sun bath” under heat lamps in Beijing Zoo on January 11, 2019.

An anteater walks toward the heater in its enclosure at the Beijing Zoo to keep warm on January 11, 2019.

Hippos are swimming in their constant temperature pool in Beijing Zoo on January 11, 2019. (Photos: VCG)