A lion enjoys specially-prepared, nutritious ice block at ZSL Whipsnade Zoo, UK on July 18, 2022. /CFP

A rhinoceros enjoys cold showers at ZSL Whipsnade Zoo, UK on July 18, 2022. /CFP

A zoo employee feeds watermelon to a hippopotamus at Nanning Zoo, China on July 21, 2022. /CFP

A zoo employee feeds watermelon to a hippopotamus in Qingdao Forest Wildlife World. /CFP

A ring-tailed lemur eats watermelon to cool off in Qingdao Forest Wildlife World. /CFP

A celebes macaque eats frozen food to cool off at Osijek Zoo, in Osijek, Croatia, on June 29, 2022. /CFP

A tiger licks a meat-filled popsicle to cool off at the Rome zoo, Italy on June 28, 2022 amid rising temperatures. /CFP